Afters Question

The announcement is almost here, and since ARC didn’t end up giving presale holders first access last year, I’m a little skeptical about how it’ll work this time around.
For those who have done ARC before, how quickly do the afters typically sell out? For example, if I prioritize Friday when they drop, is there usually still enough time to go back and secure Saturday/Sunday afterward? Just trying to get a sense of how quick it is.