Which many Kumon class to attend per week?

New to Kumon and considering it for my 3yo.
Is Kumon attendance once or twice a week in general?

I see 3 different instructors/centres near my area, two have a 2-hour afterschool window twice a week and another has 3 times a week. Do children go to any one class per week or more than one? So does it make any difference if I choose the 3-day centre vs 2-day ones?

The child is expected to spend 30 mins each time during the window, right? She will receive some math instrutions (mostly counting), try to work on questions, receive feedback on her worksheets, and get worksheets to bring home. Right?