Not all performances will be 2+ hours in length, though.
Go to, say, a show by the Cirque du Soleil; from what I've observed, the majority of those performances for which Tumbling would be the appropriate skill, tend to be well under 5 minutes in length - two or three minutes maybe. And ... to the accompaniment of music, so there's no saying the Bard couldn't maintain his Inspire Confidence as part of the "musical accompaniment" aspect of the whole, and make his perform check for an "aid another" effort towards the overall impression the performance gives to the crowd.
Of course, such a show would be abysmally SHORT, but the monk would likely give several such performances in a night (every half-hour, perhaps). With sufficient numbers of spells available, the scenario outlined above is IMO entirely feasible.
I do concur WRT "Take 20" and perform. Even "Take 10" is pushing it, IMO, but I'd still possibly allow for that - but not "Take 20". Nosir. ^_^