Shows that announce their own running time

[title of show] was the first to come to mind, and they did it best IMO!

On the totally opposite end, there was Ivo Van Hove's ROMAN TRAGEDIES - a 6-hour long production which, after maybe 30 minutes, invites the audience to move around the space and come onstage. And I remember the actor facilitating that shift in the performance made some comment about "we still have 5 and half hours to go!" or something to that effect.

 

It's a device that Shakespeare used everynow and then, especially in ROMEO AND JULIET

 

 

ErmengardeStopSniveling said: "There must be references to the runtimes in BEETLEJUICE and URINETOWN with all the direct-address to the audience?

Marla Mindelle as Celine called TITANIQUE "90 minutes" which stood out to me because the show was more like 1:45 the two times I saw it."

Yes, Urinetown features the lyric "first act lasts an hour" sung by the ensemble in the title song.

It doesn’t reference the time specifically, but at the end of A STRANGE LOOP, Thought #4 does break the fourth wall a bit to say “Well, these people aren’t going to wait forever. They want to know when they can go home and we want to know too!”

In the very first line of Lanford Wilson's "Talley Folly" Matt says

"They tell me that we have 97 minutes here tonight without intermission.
So if that means anything to anybody, if you think you'll need a drink of water or anything..."