There is no exact answer to this since it is limited by the permitted size of the URL, which according to standards, is 2048 characters. Assuming each grade=XXXXXX is about 12 characters and that there will be other things in the URL, you might cap out at about 100-150 selections.
Tried to run a multiple division report which covered a lot of different divisions (basically FC, List A and T20) at the SCG. Came up with an error so I thought I would be running too many divisions at once. I did a work around which worked.
There is no exact answer to this since it is limited by the permitted size of the URL, which according to standards, is 2048 characters. Assuming each grade=XXXXXX is about 12 characters and that there will be other things in the URL, you might cap out at about 100-150 selections.
I am guessing a bit here.
Are you having problems?