Mine dont care how big the hide is as long as it has the door on the far side.
I have had new snakes take a week or two in order to acually discover the hide... Ive even put them back into the enclosure in a manner as to direct them into the hide..(stick their head in it as inlower them down) Then they start doing it on their own..not the Brightest snake Ball Pythons hahhahaha