good stuff fred ,that audex sounds very hard,only for the brave and hearty i think.
Not really. It's full of a cross-section of the public.
I think most of struggled with our first 100km ride. Many people get comfortable with 100km and stick to that. A nice enough distance to keep yourself fit, see some new countryside, grab a pub-lunch and be back in time for tea. (9am - 3pm is typical).
From there you take it a step at a time. My first 200km left me collapsed in a comfy chair, too tired to even eat the cake provided. Now I class 200km as my 'comfort zone', in that I don't really need to prepare so much for them and they don't leave me feeling wiped-out any more. (8am - 7pm is typical)
300km is getting serious. Many people never bother trying them but, if you can do a 200 then you can do a 300 (albeit feeling wiped-out for a couple of days after your first ones). (7am - 11pm is typical)
400km is serious. Unless you are very quick (I'm not) you can't avoid riding through the night (not that it's something to avoid, it can be extremely nice to cycle whilst the world is asleep). (7am Sat - 7am Sun is typical)
600km is serious (some people think they are easier than 400s because you can bank enough time to have a rest for a few hours (sleep even). I'm too slow to take a sleep break and my, single, experience is that they are 200km harder than a 400. (6am Sat - 10pm Sun is typical).
At one time or another all these distances have seemed impossible to me (I only started 3 years ago, at 42). Slumped in a chair after my first 200km ride, it seemed impossible to do another 100km, never mind another 400km ("what?, 3 x 200km rides, one after the other? No chance").
100km leads to a 200km, 200km leads to 300km. I think that, if you can cycle 300km then you can do a 600km (I did).
I'd urge any cyclist to try a local 100km. They are strictly non-competetive. You may see ages from 12 to 80, male, female, MTBs, recumbents, touring bikes, carbon road bikes, hybrids (although touring bikes are most prominent). Some people chat to you, some don't, some people stop at pubs and some don't.
Mostly though, you pay a few quid to have someone organise the route, provide tea and cakes at the start and finish and leave you free to enjoy roads you would never have otherwise seen.
AUDAX UKRemember, it's NON competetive. Finishing times are not published. The fact that you completed the ride or not is published. You are awarded medals based on completing the distance within a fairly generous time. If Lance Armstrong enters an Audax then you will both get the same medal (even if he does finish 4 hours before you).