I've hunted out of ground blinds extensively for over 20 years,I'm a archery hunter.shot a booner with my bow on TV out of one.
Lots of good advice on this thread.how tall depends on how tall you are I'm only 5'6" tall so my 75" tall blinds work great I can stand draw my bow and shoot no problem,two of us can lay down and nap,at the same time.when we are hunting antelope.we get into our blind while it's still dark in the morning,and stay untill dark,having space makes it better.
Unlike some of the guys here,I like the zipper windows with velcro screens over the windows,we have always shot rt through the screen.doesnt alter arrow trajectory at all.after we've shot through the screen a few times,because of the velcro I can put a new one on.kind of fun to be standing there 5 yards from a game animal watching them,they can look rt at you and not see you through the blind
https://youtu.be/f7jliUqCzIs