It takes me roughly an hour a tree, maybe a bit more, a lot more if I need to go to the store and get equipment. I measure distances from other trees and mark locations with flags, dig out the sod and dig a big enough hole, roll out a section of 4 foot tall hardware cloth and cut a 5 foot length, then make it into a ring with removable zip ties. I’ll then plant the tree with mycos and backfill with existing soil. I then get about 2 cubic feet of mulch from my pile and place it around the tree, pound in a 7 foot tall metal t post and put the ring of 4 foot tall hardware cloth over the post and around the plant. I then hammer in a bamboo pole opposite the post to prevent the ring from swinging in the wind and zip tie the ring to both the T post and bamboo pole. 3 trees last night with me rushing took about 3 hours, and I luckily had everything I needed.
Most of the time is spent making protection from deer, but if they go a single night without protection they could get browsed and easily ruined.
Depending on what part of my property, it is either a layer of topsoil followed by a clay loam mix, or just tons of rocks and bricks and what not. always fun (sarcastic) to pick out a growing spot and not be able to get an inch dug from all the rocks and clay.
If it is too dry though it is near impossible to dig too!