DD 's team has optional hitting once per week and a team practice once or twice a month. However, we have girls who live several hours away and are 16u, so the girls are expected to work regularly at home. At this age, and at the higher levels, it is a lot less instructional and a lot more refinement. I think, if you are a team with local kids, kids who need more instruction, and play a mostly local schedule, once or twice a week is fine. Any more than that is overkill, especially if your players are taking private instruction.