What is minimum and maximum # days for load balance?

Hi,

What is the minimum and maximum # of days for my load balance? It is under both my graduating interval and my easy interval. I’m not sure how to match those settings to suggested settings online, as all of the current online settings do not have those subcategories.

Load balance is added by an add-on, so I’ll move this to the add-ons section.

Can WE know when the load balancer send a cards?