the booked artist in a folk club will usually do two fourty minute spots which is more than you will get in a concert and cheaper.

I can't argue with the cheaper part of that statement, but if I went to see anyone at Buxton Opera House or The Lowry in Salford and they only did two 40 minute sets I'd feel very short changed indeed!

A 7:30 start with two 40 minutes sets and a 20 minutes interval takes you to the witching hour of 9:10.

I don't think I've ever been out of a concert anywhere that early ...