I think right now there isn't much reason to use training ranges. So I propose this change:

Any one with an open wack timer can do a training range, but its duration is extended two hours.

First, this decreases the total amount of time someone has to spend waiting. Considering the "pace" of gun training has quickened a lot, it's left training ranges somewhat obsolete. So this would reduce the total training range time by one hour. Second, this also allows people to decide between shooting a target and attending the training ranges. So, for instance, if I shot an RIA I'd have to wait four hours (1hr timer + 3 hrs) to do a training range. So if you want to do a training range, not only do you have to wait out the flight and wack timer duration of the range, but also not shoot anything in the four hours leading up to it. I think if those three hours were removed, training ranges would see a lot more use.

Just a thought.