AC 138 today at YYZ. It took 15 minutes to position the bridge and then not correctly. Mrs W was watching on the tail cam and after 5 minutes said "It needs to be lowered by 3 feet or so". After a couple more minutes the door was opened and the SD got the captain. "There is quite a gap there......:. The captain deemed it not safe and so they adjusted it for another 5 minutes. Even when done and we deplaned there was still at least a 6 inch drop from the plane to the bridge. We may have arrived 7 min early but deplaned 10 min late.