I went to a blackalicious show at Bimbo's for 20$ and they rocked it for nearly three hours, and the next night i went to a musiq concert with Cee-lo as the opener for 30$ at the Fillmore and cee-lo was on for an hour then musiq was on for an hour, i was highly dissappointed. but 90 min sounds like a decent show, i wouldn't be mad at that.