I've got a bone stock original automag rt. A 68-45 flat line tank set at 850-900 psi. And a 12" dye ultralite. And 16" sp AA. AGD foamy bolt. How many shots ballpark will this get me?

First big scenario played will be next month. And I've never had a 4500 fill to base an assumption off of. Don't really want to carry more paint than I can shoot with a tank on the field either. So any rough help would be much appreciated. Please and thank you
BTW. Yes I'm sure this has been asked before. But I am inept with finding it.