Hi fire one
The first time i did it it took me 2 full days,so around 16 hours.
The last time,6 hours start to finish.
That is completely on my own,taking the floor out & dropping the gearbox suspended on a block & tackle rigged up in the cab.Easier than an engine crane,easier to move backwards & forwards,and nothing on the floor to get it the way when working underneath.
Marc