Generally if you smoke the crap out a briar, give it a correspondingly long break. A bowl, I would just give 24 hours before smoking again. If I smoked 4 or 5 bowls in a day, I'd give the poor feller a good week to rest.

Some old timers just smoked the same pipe all the time until it was too caked to work anymore. Not that that's a good approach, but it won't ruin anything to smoke it well, and give it a good rest when you've moved on to a different pipe.