Poor Bumper, that is a huge cast! When Molly broke her outside front toe she was in a much smaller cast, didn't go all the way up. She tolerated it for 3-4 days, then insisted I take it off Vet OKed it, just said to make her take it easy. When Sallie broke her toe, it stayed in a cast longer (inside toe, bad break) and she did get some sore spots from the rubbing.
The two worst things about toes are the risk of sore spots from the cast rubbing and getting infected, and it takes so dam long for the toes to heal. Months!