Depends on how much thrashing around it takes to setup and when I'm planning to hunt it. A stand setup that's never been used before with a lot of prep work and clearing to do, or a dedicated early season sit I like to get up a month or so ahead of time for sure. Established site that can be quickly and quietly hung, or a rut stand, I don't worry much and hang when needed. I've killed many mature bucks from stands hung just a day or two ahead of time, or the same day.
That said, I like to fiddle with stands and usually start hanging them late summer and end up with 30 or so out across a couple of states, often only hunt 1/2 or so in a given year for one reason or another.
R