It's common practice to feed young ones every five days. If you want to, and if he'll eat that often, I don't see anything wrong with it. I also think every seven days is plenty. It's really up to you.
As for the poop...it could be as soon as about a week after eating...or it could be several weeks before you see any. He may even poop within a day or two, but if so, that is likely waste from previous meals and not the one you just fed him. Young, growing BP's tend to poop somewhat infrequently because they are very efficient at absorbing so much of the prey into the energy of growing...it can take several feedings to build up enough to require elimination.
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