I'd say around the 36-hour mark, barring a sad attempt at bedtime plus several naps. lol
A little sleep-related story for y'all: I was supposed to see a virtual concert by Louis Tomlinson once, but I'd had a horrible previous night. I went down for a nap like an hour before the concert (2 pm) thinking I could wake up in time to watch, but I ended up sleeping through the whole thing, only waking up at like 5:30 pm. I'm still kicking myself, bc Louis is as yet the only 1D member (besides Zayn, but he rarely promotes anyway lol) that I haven't seen in concert, virtually or in person.