A durango diff remove-strip-empty-fill-rebuild-refit takes about 20-25 minutes.
I have two or three spare, filled diffs ready to go in the cases, so more like 10 or so minutes.
(I think its 7 screws at the back, 9 at the front to get to the diff itself, then another 4 to crack it open.)
Unfortunately, i've managed to rub off the oil weight that i cleverly wrote down on the cases.
