I’ve done it successfully with 4 days but I think the person wanted to know if you had to do 7 in order to walk and you don’t.
of course, if you want 7 nights, then you’d want to walk it with 7 as you mention, but someone who only wants 3 or 4 nights can still attempt it. Again, walking at 7 is not the same as 11, but if you’ve secured a room at 7 months for 3 nights, no one can book that room for night 4 ahead of you but a resort owner.