It takes me days to do an engine swap. I don't do them often enough to remember the procedure, so I always make a 'bible' with full pictures/diagrams. Bagging or returning the bolts back to their holes. Then I give the engine bay a nice clean up with degreaser (makes finding leaks easier later and looks better), before moving over to the parts/bolts which end being cleaned in petrol and/or going on the wire wheel grinder. I also copper slip as much as safe to do on the re-build, as I always assume it'll be me taking it out next time. Then there is torque settings, fluids to sort. You may notice - I don't rush.
Last engine swap took less than a day to get the engine & box out. A day prepping the new engine (IE swapping parts over, cleaning them) and finally a day to get the engine back in. I will say it then took about another 5 hours work as I was swapping a 2004 engine into a 1998 car so the wiring and vacuum pipes took some work. As an added bonus, I converted it to COPs so did away with the coil pack.