I usually rotate mine after a bowl, but if i feel like having another bowl of that particular tobacco, i let the pipe cool down, run a pipe cleaner through it and lightly swab bottom of bowl with cleaner and fire another bowl up. In between this, i might just pull out another pipe and have a bowl of a different tobacco in between. I don't think i have ever ran more than 3 bowls through one pipe in a given day. Not to say that i would never do that, but just has not happened yet.
The girlfriend and i are heading down to charleston SC this weekend for a good old fashioned southern wedding, and i'm trying to decide how many and which pipes to bring, lol. i have 15 pipes, of which include a mm, a meer, and a morta, the rest briars. i'm thinking the morta or meer, cob, and a briar or two plus a bunch of different tobaccos. Not to hijack the thread, but anyone else ever have this dilemma when traveling? I am driving down there, so do not have to worry about them getting damaged on a plane.