Mina
Staying Night in Mina
11th and 12th Night in Mina
Question
Permissible times for the pelting of the Jamarāt
For the 10th Zul Hijjah - time of Rami begins from sunrise for all schools except the Shafi' school allows from 2nd part of night.
For the next days 11th and 12th - time starts after Zawaal
The end time for pelting on all days is before Fajar of the next morning, although better to complete before sunset of the same day.
This answer addresses the situation as described. Rulings can turn on specifics — for your own case, ask directly.