How long do the shows usually last? We are seeing Trippie redd on March 7 at 8pm

Expect to be there at least until 11pm.

At least the pizza man was there at 12 o'clock

Saw Deadmau5 and he had 2 openers and played past 12 midnight

Hmmm, my experience, goes no later than 11pm. With opener starting @ 8.

It depends on the artist. The Korean pop concerts I've been to have lasted about 2 and a half hours.