If you're blind hunting I'd go earlier. The skys already light enough for them to see you going in if they're on the roost. They might even be coming down at that time and starting to move. I'll be in my blind at 5-5:15
Saturday for the youth hunt our roosted bird was coming down before 6am. We where in the blind by 5am to play it safe as the bird was one the edge of the woods only 120 yards away.
Yup, I only have to go out the back door but 5am is time enough for me to get back in and set up. 99% if the time I have the bird roosted the night before.