I recently set a poll stating which course I should make on Memrise, based on the Duolingo styles. The winner was Finnish, then Catalan. Should I do both? Or focus on just one?
- Finnish
- Catalan
- Both
0 voters
Do as much as you see fit! 
But, seriously, I suppose quality over quantity is the most important thing.
It’s perfectly possible to learn multiple languages at once, but it takes some serious determination and focus.
A lot of the time what’s difficult about learning multiple languages is that you may start mixing up the vocabulary of the different languages, especially if the languages are similar.
As for myself, I’m studying both Spanish and Catalan. I’ve been able to keep the two separate in my head when learning, so mixing has not been an issue, but it does take a lot of focus.
When in comes to Catalan and Finish, those are so different from each other that it should be easy to study both simultaneously if that’s what you want. 