quite a while ago (I had hair) I worked for a then well-known consulting company, churning out graphics and fiddling with Excel.
They had a fabulous rule re out-of-hours work (which was very regularly needed), in that ANY CONSULTANT could ask you to work on anything, for as long as it takes (regularly overnight!) until it was sorted.
BUT the relevant Consultant had to stay within sight of you until you were happy that the job was done.
We did crazy hours, a 24hr stint was not unusual - and earned very well for it in the process, and no Consultant ever removed the urine...
I still think it was a most effective approach.