It takes at first about 2 weeks to begin to get use to being in a long leg cast. What happens after a few weeks you actually become quite use to being in a cast and you do not mind at all. I know in my case I actually like wearing a long leg cast, I like the support the cast gives my leg.
My nephew used to put lots of powder in it. I don't really know how it helped relieve him of itching but he said it did. After several weeks, it started stinking like... gahd I can't even describe. Best of luck :|
Paint, write, make music, eat pizza.