I just have to say that I have been a UK folkie for many years but I did spend a couple of years playing 'old time' music (mainly American, Charlie Poole et al) and had some of the best sessions ever. Yes some tunes/songs often went on for ten minutes plus but it was a real opportunity to get into a tune/song and try out all sorts of improvisations and work on my guitar playing technique with other dedicated musicians. Technically and musically I learned so much. You only get out what you are prepared to put in.