When you first build the character, your Linguistics grants you a certain number of starting languages.
- 1 = 1
- 2 = 3
- 3 = 6
- 4 = 10
- 5 = 15
If you also have the Natural Linguist Merit, you gain +1 for each dot in Linguistics as well. So a maximum of 20 languages.
Once you enter play, Linguistics no longer gives you additional languages, it just makes it easier to learn them and to pick up on certain other things the rolls would be used for.
Learning a new language is a downtime roll of Intelligence and Linguistics. The difficulty being 7 normally or 5 for those with Natural Linguist. In order to learn a completely NEW language, you need 35 successes. In order to learn a language in the same family tree or a dialect of a language you already have you only need 25.
There is not a limit on the number of languages you can eventually learn, so long as you have access to the base with which to learn it.