In reply to Ban1:
I have a pair of 30m half ropes for peak, dales and most quarries, I find this ideal.
I personally do not like belaying or being belayed on a folded rope as I find it confusing, and I think my belayer will, I do not like my belayer to be confused.
For British Trad Lakes Wales etc a 50m, a 60m IME is a pain people will witter on how great they are but they take more pulling in are generally heavier, and clutter the belay, you will often find that people with 60m ropes are winter climbers who are too mean to buy two ropes or people who bought a 60m because it was on a deal.
Winter climbing and foreign trad a 60m.
People will say other things, but they are wrong
Your first reply is actually very near the mark, ropes do breed, they are doing under my bed at home, I also have a selection of sports ropes.
Post edited at 08:04