Depends on what you are doing, full rebuild? Once I got mine out it took me probably 4 hours total to tear mine apart to remove the mainshaft for machining to accept a RE hack and tap sye and and put it back together.
Tips: go buy some RTV silicone in bulk in the big tubes for chauking guns, way easier to apply and saves time and money.
Get a big tube of Blue locktite and put it on every bolt.
Get new seals, for the front driveshaft output, transmission input and output if not putting in SYE. Also get a new star washer and yoke nut for the front output while you are at it.
If putting in a RE hack and tap, make a star washer for the end of the cut and drilled mainshaft, I didnt and wish I had.
Be prepared to replace the chain if need be, but its expensive. 400 canadian whne I priced it out.