Fumed Pipes

So I have this pipe I got maybe 3 months ago or so, and its about half way fumed with color, and is starting to get clogged with resin some hits. About how long does it take to completely fume out a pipe? I use every day and smoke quite a bit out of it, nothing too crazy though. It is a pretty good size pipe, but its not super huge.

Also are there fumed pipes that change any color besides blue? I've had yet to see a red or green or yellow fumed pipe, only blue.

I got one that turns yellow its fucking awesome. For a medium to small pipe, you usually have to smoke at least an ounce of of it to fully fume it.