We occasionally do a Sun afternoon 12-6pm. We make a day of it and bring sandwiches, flasks of coffee, cream cakes of course and take a longish break halfway thru. It allows us to run thru our full repertoire to keep things sharp for any possible eventuality.
TBH we generally get thru the songs and finish up around 5-ish but it makes rehearsals a much more relaxed affair if not rushing thru songs etc.
Dave