What if you had just 30 mins to be on your community?
If I had only 30 minutes, my schedule would be something like this:
10 min - comment on other posts after understanding the post properly
5-10 min - time to create my own post for the day
10 min - comment some more on other posts
I think of it like attending school or university:
Walking through corridors as I catch up with people around me.
Attending class and getting my things done.
Meeting people again before heading back home.
A community is pretty much a gathering of people, working like any other place that has a number of people.