Toraiz working hours & responsibilities

I’m trying to move to Shizuoka and the work opportunities are slim. A friend suggested supplementing my income with online classes. I’ve found Toraiz and they have early and late classes, so I could handle that with another job.

Is anyone working for them? Is there a minimum number of hours I have to do? The job ad I saw said 10. I don’t really want to do more than that or work on weekends. Is that possible? I’ve read on here that there’s a lot of (unpaid) admin. How much?

Thanks.