I don’t think that there is any way to tell before purchasing how many pages will be printed. If I am wrong, please enlighten me :) If there isn’t a way, this would be a great feature.
I generally only print pdf patterns at home when ithe pages required are fairly limited. I definitely admire people who have the patience to print, tape, cut, then make flat pattern adjustments- all before cutting into fabric!
I didn’t find this topic listed previously. Sorry if I missed something already posted.