Totally varies by release and can. Some releases sell out all cans in a few hours and some have all or almost all cans lasting until the next day. Follow them on Instagram for updates on can availability.
Check instagram as Other Half keeps it updated frequently.
Last Saturday full supply was still available after Noon with no limit on purchases and no line.
It depends on what's being sold. The line moves differently each week. If it's a week with big-name collaborations, expect people will sleep out overnight, so if you're not in line by 6am, you're really rolling the dice and could come home empty-handed. Lately, I've been going to normal Saturday releases, showing up at 9am for a 10am release (which often begins early), and I'm out of there by 10:30 with as much beer as I want. Last summer, I would often stop by at 2:30pm, and there would be no line, but only 2 of the 4 beers were remaining. If you look at Instagram, Other Half is pretty good at posting the times when their cans have sold out.
Thanks! Your answer is awaiting moderation.