if you are talking about turkeys then i usualy set them up and hunt in them right away. if anything i set them up the day before so all we have to do is walk in and all our equipment is waiting on us. i agree with "npokat32" deer are a little different, they are smarter about these things. young deer and some does don't mind it but more often than not they will get nervious. if you hide the blind in the bushes then it doesn't matter what you are hunting they won't have a clue.