Finder limit noob question



So I'm following "Building with XF2" video tutorials. I'm trying to build a simple addon that shows thread titles that are too long.
So far I made addon that shows all threads (2) from my new local xf installation. I have 2 questions.

1. How do I limit to say 20 result, so on my production forum it will not fetch thousands and thousands?
2. And how to incorporate in the code strlen()? Should I use it in my Controller, or in foreach loop in template?

Thanks in advance.

so far I have this...

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