Yeah that's my point, the dungeon is much bigger and that's why it should take less runs to get the final reward which is the cloak.
It takes 13 runs to get the jewel in BB/BE, an average run takes 50-60min so 1h times 13 = 13h to get the jewel.
BUT bastion stairs takes about 3h to clear all the wings and you still need 13 runs so 3h times 13 = 39h
13h vs 39h, the pve grind got much worse for some reason, not even Hargrim can defend this. The difference is huge.