Atleast an hour to revise so that it stays in the minds and is good for developing retention as well

Personally I just spent however long it took me to understand the content I wanted to learn

I never revised daily as a student just because I take so long to finish homework itself

The duration doesn't really matter. As long as she understands the subject.

That 2 hours should include revision and doing of their homework

Understanding is more important than the actual time revising

1 hour is fine. not about how much time they spend

Should be enough It’s already very stressful

More of understanding concepts than the time

Depends on the subject I think.