You would have to really smoke fast and hard to burn out a pipe after just 3-4 bowls. If your tobacco is hot and your tongue is burning then there's a good chance you're smoking fast and hot, but your mouth will fail before your pipe will. Unless you did that every time you smoked then that would be a different situation, but it would still take more than a handful of bowls to ruin the pipe.
To many times a new pipe smoker worries about way more things than they should. Reading up on the hobby, and/or getting information from a tobacconist etc. is good, but sometimes it causes the new pipe smoker to worry about certain things instead of just enjoying the pipe and tobacco. As they say, ignorance is bliss and sometimes, and sometimes it can be.