Depends how much HAB you expect
FWIW, on our trip we did several side trips, which might have had up to 4 hrs pushing/riding. you;re getting higher and pushing your limits so gradients you’d normally spin up have you pushing.
The day getting over the pass began with breakfast at 4 am and had 6-7 hours pushing/carrying to the pass.
You probably won’t have the luxury of taking separate shoes over the pass as your sherpa/transport might not come over the pass with you. We spent ~ a week warming up riding from Pokhara, working our way up the Lower Mustang with plenty of side trips to get high and some cracking riding coming down. After the pass we smashed out some epic 80 km days getting back to our rendezvous at Besi Sahar.