Language learning rules

[AmbientRaven]

Hi folks,

A player recently asked me about rules for learning new languages in game. I looked through the DM and Player hand book but couldn't see any rules.
Now, My players are level 8 (they started at 1) and most (3 of 5) have been together for almost a year in game time.

So I was wondering, what do other GM's do in regards to learning new languages?

Thanks for your help!

[Giant2005]

What you are looking for is on page 187 of the PHB, under the heading "Training".