Would probably knock half hour off maybe?
Maybe not even that, if you have the right tool it's not that hard.
Beam is a tosser to put back sometimes, last one I did just didn't seem to line back up. Didn't change the bushes on it just took the axle off, went to put it back and the poly bushes on it didn't really seem to line up properly. Had to slightly compress them which didn't seem right.
Also, make sure the wheels are at driving height before tightening the bolts fully.
Put them on mildly tight but so it can still move, careful drive over a bump or two to settle then tighten. Easier on a ramp I suppose.