Meet someone at the time when you are not working

How to name a period of time, that you want to meet a person you work / study with at, which is not during the studies or work?

Do you want to have a lunch (off-work?)?

I can help you with that (off-work?).

I usually study in my (off-work?) time.

Is that a comprehensible phrase? Or there are better alternatives?

Solution 1:

We generally use free in a variety of forms to cover your examples:

Are you free for lunch?

I can help you with that when I'm free.

I usually study in my free time.