Compiled and fact-checked by Tommo, Verus founder · Last verified August 2026 · Spot an error?
Running · Ultra Marathons
Tenacious Ten Hour Endurance Challenge 2027
- Race day
- Saturday, 10 July 2027
- Location
- Pengenffordd, near Talgarth, Powys, UK
- Distance
- 31.1 mi / 50.1 km
Tenacious Ten Hour Endurance Challenge: 10 July 2027, 31.1 miles, from Pengenffordd Common, near Talgarth, Powys. Entry, route and a pace chart.
Tenacious Ten Hour Endurance Challenge Race Timeline
303 days to go
More than 126 days out — a good window to build a consistent base before ultra-specific training ramps up.
Tenacious Ten Hour Endurance Challenge 2027: quick answers
When is Tenacious Ten Hour Endurance Challenge 2027?
Tenacious Ten Hour Endurance Challenge 2027 takes place on Saturday, 10 July 2027.
Where does Tenacious Ten Hour Endurance Challenge start?
Tenacious Ten Hour Endurance Challenge starts at Pengenffordd Common, near Talgarth, Powys. The organiser hasn't published a finish location.
How many miles is Tenacious Ten Hour Endurance Challenge?
Tenacious Ten Hour Endurance Challenge is 31.1 miles (50.1km).
How much does Tenacious Ten Hour Endurance Challenge cost to enter?
Entry through SI Entries — check the official site for current pricing.
Key Race Metrics & Overview
- Date
- Saturday, 10 July 2027
- Distance
- 31.1 miles / 50.1km
- Location
- Pengenffordd, near Talgarth, Powys, UK
- Start Point
- Pengenffordd Common, near Talgarth, Powys
- Surface
- A strenuous and technical 2.7-mile loop over Mynydd Troed in the Black Mountains
- Cut-off time
- Ten hours. Distance is the outcome rather than the target.
Not published by the organiser at the time of writing: finish point, start time, age requirement, tracking app. Verus records these as unconfirmed rather than estimating them — check the official race website closer to race day.
Direct Entry Summary
Entry through SI Entries — check the official site for current pricing.
Ballot Policy
No ballot — entry is direct through Limitless Trails.
Tenacious Ten Hour Endurance Challenge Race Day Weather
A real forecast appears here once one exists for race day — usually about a week to ten days out. Nothing is shown until then, because a made-up forecast is worse than none.
Tenacious Ten Hour Endurance Challenge Route Map & Elevation Profile
Starting at Pengenffordd Common, near Talgarth, Powys. The organiser hasn't published a finish location. Total elevation gain is not published for this event, and Verus does not estimate one.
Is Tenacious Ten Hour Endurance Challenge flat?
No official elevation figure is published for this course, so Verus doesn't state one. The organiser describes the going as: a strenuous and technical 2.7-mile loop over mynydd troed in the black mountains.
Tenacious Ten Hour Endurance Challenge Course Profile
Elevation change not published for this event.
Tap a point on the course for details.
Pengenffordd Common, near Talgarth, Powys
Start line.
Where Tenacious Ten Hour Endurance Challenge starts and finishes
Tenacious Ten Hour Endurance Challenge starts at Pengenffordd Common, near Talgarth, Powys. We haven't been able to place those on a map accurately enough to show one — a pin in the wrong place is worse than no pin.
These are the start and finish points, not the route. Verus doesn't hold course files for this race, and drawing a line between two pins would be a guess you might end up training on.
Full Tenacious Ten Hour Endurance Challenge Route Breakdown
A ten-hour timed challenge in the Black Mountains: run as many laps of a strenuous, technical 2.7-mile loop over Mynydd Troed as you can inside the window, from Pengenffordd Common near Talgarth.
Tenacious Ten Hour Endurance Challenge Pace Calculator & Splits
Tenacious Ten Hour Endurance Challenge Pace Calculator
Enter a target finish time to see your pace and projected splits.
Average pace / mile
7:43
Average pace / km
4:48
Tenacious Ten Hour Endurance Challenge Pace Chart
Split markers calculated for standard checkpoints — no official pacers are confirmed for this event.
| Target | Pace /mi | Pace /km | 5K | 10K | Half Marathon | 30K | Finish |
|---|---|---|---|---|---|---|---|
| 3:00 | 5:47 | 3:36 | 17:59 | 35:58 | 1:15:52 | 1:47:53 | 3:00:00 |
| 3:15 | 6:16 | 3:54 | 19:29 | 38:58 | 1:22:12 | 1:56:53 | 3:15:00 |
| 3:30 | 6:45 | 4:12 | 20:59 | 41:57 | 1:28:31 | 2:05:52 | 3:30:00 |
| 3:45 | 7:14 | 4:30 | 22:29 | 44:57 | 1:34:51 | 2:14:52 | 3:45:00 |
| 4:00 | 7:43 | 4:48 | 23:59 | 47:57 | 1:41:10 | 2:23:51 | 4:00:00 |
| 4:15 | 8:12 | 5:06 | 25:28 | 50:57 | 1:47:29 | 2:32:51 | 4:15:00 |
| 4:30 | 8:41 | 5:24 | 26:58 | 53:57 | 1:53:49 | 2:41:50 | 4:30:00 |
| 4:45 | 9:10 | 5:42 | 28:28 | 56:57 | 2:00:08 | 2:50:50 | 4:45:00 |
| 5:00 | 9:39 | 6:00 | 29:58 | 59:56 | 2:06:27 | 2:59:49 | 5:00:00 |
| 5:30 | 10:37 | 6:36 | 32:58 | 1:05:56 | 2:19:06 | 3:17:48 | 5:30:00 |
| 6:00 | 11:35 | 7:12 | 35:58 | 1:11:56 | 2:31:45 | 3:35:47 | 6:00:00 |
| 6:30 | 12:32 | 7:48 | 38:58 | 1:17:55 | 2:44:24 | 3:53:46 | 6:30:00 |
| 7:00 | 13:30 | 8:23 | 41:57 | 1:23:55 | 2:57:02 | 4:11:45 | 7:00:00 |
Tenacious Ten Hour Endurance Challenge Finish Time Estimator
Enter a recent 5K, 10K or Half Marathon time to estimate your Tenacious Ten Hour Endurance Challenge finish time.
Your 5K time
Estimated Tenacious Ten Hour Endurance Challenge finish
4:47:21
An estimate only, based on Pete Riegel's race-time prediction formula. Real marathon performance depends on endurance, training specificity, pacing and race-day conditions — not just your speed over a shorter distance.
Training for a different distance? Try the full pace calculator, race time predictor or pace chart.
Got your target time? Save it to your profile.
Tag Tenacious Ten Hour Endurance Challenge, set your goal pace, and let Verus track your countdown, training and fundraising in one place.
Start Your Verus JourneyTenacious Ten Hour Endurance Challenge Race Day Checklist
Tap items to mark off your race-day readiness.
- Race number attached, and any timing chip fitted per your race pack instructions
- Weather-appropriate kit, plus something warm and disposable to discard before the start
- A plan for reaching Pengenffordd Common, near Talgarth, Powys
- A meeting point agreed with family and friends for after the race
Training Strategy for Tenacious Ten Hour Endurance Challenge
20-24 weeks is the realistic window for a first 31.1-mile ultra, assuming you already have a marathon's worth of base behind you. The block that matters is back-to-back long weekends — a long run on Saturday followed by a second, slower one on Sunday — which builds time on feet and teaches you to run on tired legs without the recovery cost of one enormous day. Practise your race-day nutrition on every one of them; at this distance the stomach fails before the legs do.
This is a largely flat course, so most of your long runs can mirror that — flat and steady, building time on feet rather than hill strength.
Drop volume hard across the final three to four weeks — further out and steeper than a marathon taper, because a 30-mile training day costs weeks of recovery, not days. Keep some easy running and a little terrain-specific work in, but the goal is to reach Pengenffordd Common, near Talgarth, Powys with fresh feet and a rested gut rather than one more long run in the bank.
Lock in your target pace using the interactive splits calculator below — no official pacers are confirmed for this event, so a pace band on your watch is the more reliable option.
Test your race-day fuel and hydration plan on your long training runs, not for the first time on race day — check the Race Day Checklist below for what's actually on this course.
31.1-Mile Ultra Nutrition & Fueling Plan
A deliberate increase in carbohydrate over the two to three days before the race is the well-established approach at marathon distance.
Eat a carbohydrate-focused breakfast two to three hours before the start, and stick to something you've already tested in training rather than trying anything new.
Most runners take on carbohydrate every 30 to 45 minutes from about an hour in, alongside fluid at the on-course stations.
A mix of carbohydrate and protein in the hour or so after finishing supports recovery.
Tenacious Ten Hour Endurance Challenge Charity Places 2027
No formal charity-place scheme published — runners commonly fundraise for a charity of their own choosing.
Lead with your personal story — explain why the charity matters to you. Personal connection generates 3x more support than a generic link broadcast.
Share key training milestones on Instagram (first 10-miler, peak week, race week) with your fundraising link in bio. Publicly thanking donors prompts secondary gifts!
Running Tenacious Ten Hour Endurance Challenge for charity?
Link your JustGiving page to Verus and show up right here alongside other Tenacious Ten Hour Endurance Challenge fundraisers — goal, progress and story, all in one place.
Add Your Fundraiser to VerusTenacious Ten Hour Endurance Challenge Frequently Asked Questions
Everything you need to know for race weekend.
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Race details independently compiled and fact-checked by Tommo against the official Tenacious Ten Hour Endurance Challenge site , last verified August 2026. Always confirm official timings and policies directly prior to race day.