Most units I wear for about 5 months. I could wear them longer if money was a problem, but because I'm able to get units easily, I wear them for shorter periods. After 6 months the hair will not look quite as natural. It still looks fine, and if you use a lot of styling you won't notice a difference. But if you like the natural look, without product, then the hair sometimes lies a bit funny. Hard to describe. You also need to wash it more, because washing it seems to add back moisture for a few days.

Full cap seems like a little more work, and they are more money too? But I might try one sometime actually, as it would be cool to be able to go shaven headed for the fun of it