I think I'm going to have to start putting a belly band on one of my boys.

My question is, once you put one on, how long do you leave it before changing to a fresh one? I work away from home during the day and I'm concerned that he might get chapped or get a rash if I don't change it right away after he pees. Do the pads in the band keep the moisture away well enough for him to wear a band while I'm at work?
I'd also appreciate any recommendations on where to get cute, good belly bands.
Thanks!!
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He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion. -- Author Unknown