Busy high $$$$ gig here in Cincy. 4 hour time period, either three 1 hr's with 30 min between sets, or (2) 90 Min sets with 20-30 in between for a shorter total time at the club. Club owners are realizing three sets and the club starts to empty after the 2nd set ( usually 9-1, so if the 3rd set starts at 11:30, they've many times lost the crowd) but 2 90's starting at 8;30-8;45, keeps the crowd there till midnight, because the 2nd set starts by ten and continues to 11;30, so the folks are drinkin longer.