I've read various sources - some say it's OK and some say don't. They make you do them every day in the military, and it seems to work there, so therefore go for it! It's also individual - if you get into the hundreds, like I do, you may want to put a day in between.
"It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt." Mark Twain ;-)