
It does depend on the judge, as with our breed (bullmastiff) most have a slightly overshot/ undershot jaw, Iv seen one dog where its quite bad sometimes it wins very good places other times its chucked out of the ring.
It might be worth to look through google for the judge and see what they have placed in the past, just give it a go as an hour and a half is not that far we average just over 2 hours for nearly all our shows apart from this weekend where its only 15 minutes. yay