Do the free stamina restores refill? I.E. Do you get 3 free restores per day? per week? or ever?

When do players stamina refill in terms of time?

I.E. If i left me team alone, how long would it take for a player's stamina to refill on its own? Let's say his endurance is 10.

1. I get 3 free restores per day.
2. This player would be refilled for 2 hours and 30 minutes. Or something near it.