Are some of the people on this site teachers? How do they have time to answer our questions? Don't they have to grade papers and such? I'm just curious and grateful that some people are willing to always be on here.

Answer 1

Retired teachers are the norm among our tutors.

We have time whenever we have time! It depends on what's going on with the rest of our days.

Answer 2

Most of us are "retired" teachers or professors, or retired PhD folks, who have a keen interest in helping develop students. And some of us are also trying to payback what we owe the society that provided education for us, and gave us opportunity. So all are volunteers.
Thanks for asking.