My routine most closely parallels Pstlpkr's. My pipes, about 15 low-end and mid-grades, chosen by whim rather than schedule,
have been able to handle a big smoking load: 6 - 8 bowls/day. When your pipe gets "sour", so to speak, you'll know it!
That's only happened to me one time, and it's an unforgettably vile experience.
I think it helps a lot to run a pipe cleaner or two through your pipe after every smoke. They then seem to need less rest
and periodic scouring -- which for me comes to about three times a year.