Is there a standard or rule of thumb for how quickly I can raise a sagging beam that supports my floor joist. The home is 90 years old and due to some previous notching of a couple of the floor joist to allow for duct work, plumbing, etc, the floor above has a significant slope. I'm not trying to restore it to level, just improve it. I have heard a range of one turn a day(on the floor jack) to one-half turn a week. Any suggestions?