I usually get to my stand just as it is breaking light. Not light enough to see to shoot but just light enough to walk in without a flash light. I do go in when it is dark at times too. Just depends how well I can time getting to the woods.
It wouldn't hurt to get there a little earlier though because I have shot deer after being in my stand for 15 minutes or less. I take a chance on getting there when they do by going in right at day break.