What are the time limits for each distance? I don't seem to be able to find a simple list
Mostly between 15kph and 30 kph average speed, although the minimum goes down to 12 kph for 'Populaire' events (these are denoted by BP rather than BR/BRM). you should find it next to each event in the Audax UK calendar on the website.
It effectively means that you have between 6.7 and 13.3 hours to do a 200k, although if the event is over distance (e.g. 215km) you can get a little bit of extra time.
Maximum average speed is usually 30kph although organisers are free to pick a lower average speed if they want (some set it at 25kph to reduce the time they have to have the later controls open for) although they only tend to do this for very hilly events as the fast riders will be ahead of this.
Minimum average speeds:-
For BRM rides:-
Between 200km and 699km it's 15kph.
700km to 1299km it's 13.3kph
1300km to 1899km it's 12kph
1900km to 2499km it's 10kph
From 2500km onwards it is 200km per day.
Time limits for a BRM 200 are fixed at 13h30. A BRM 400 has a fixed 27 hour time limit.
No extra time is given on a BRM ride for any over-distance part.
BRM rides should not be excessively overdistance, I think it's 10% although this has been ignored (there was a 225km BRM 200 ride in the calendar last year).
For BR rides:-
Same as above except the organiser can pick a minimum average speed for an event between 200km and 699km to be anything between 14.3kph and 15kph.
With BR rides some of the over-distance part can count for extra time. The extra time should be calculated against the minimum distance between controls and not the routesheet distance.
So a 200km Audax that is billed as 213km (on the calendar/routesheet) but has 208km shortest distance between controls could have time limits of:-
13h30 if the ride is BRM. Note that it is not 200/15 = 13h20 since the time limit for a BRM 200 is set at 13h30 by the regulations.
BR rides:-
13h20 if the organiser uses the 200km base distance and applies the 15kph minimum average speed. They shouldn't really do this, but many do.
13h59 if the organiser uses the 200km base distance and applies the 14.3kph minimum average speed. Some do this.
13h52 if the organiser uses the 208km shortest distance and 15kph.
14h32 if the organiser uses the 208km shortest distance and 14.3kph.
14h12 if the organiser uses the 213km routesheet distance and 15kph. They shouldn't use the routesheet distance though, unless it is very close to the shortest distance.
14h53 if the organiser uses the 213km routesheet distance and 14.3kph. They shouldn't use the routesheet distance though, unless it is very close to the shortest distance.
The shortest distance between controls isn't usually published anywhere, which is why the timings in the Brevet card don't always match up with what is expected. Some organisers do adjust the control distances to the minimum distances when setting up the content of the Brevet card. I don't have my stash of Brevet cards to hand to go find one. You'll notice this as the distances on the Brevet card don't match the control distances on the routesheet.
It all depends on what the organiser puts in the relevant boxes when creating the event.
Populaires:-
There's no official minimum speed for Brevet Populaires (all rides under 200km and a few rides over 200km). It's up to the organiser to pick a suitable minimum average speed that fits with their controls and plans for the day. Most calendar entries have a minimum average speed between 10kph and 15kph.
DIY populaires used to be 8.3kph minimum average speed.
The 1300km Populaire version of LEJOG/JOGLE has a minimum average speed of just 3kph.
The 1400km BR version of LEJOG/JOGLE has a minimum average speed of 12kph (in line with the guidelines above).
All of that and then I find this:
AUDAX Max and Min speed