Once my pan was off it took me 30 minutes. I used a neoprene seal from Fel-Pro. I did not have to loosen any other caps so the crank could drop a bit. I was lucky as my old neoprene seal was pretty stiff and pulled out quite easily. If you get a two piece neoprene seal try to stagger the ends so they do not line up with the main cap/block join. Put one end in about a half inch past the block in the groove and the other will stick out accordingly. This will help stop future leaks.
Another thing. If I had my pan off I would take off the front cap and tap the two holes where the bolts go forward to the timing chain/gear cover. Then you can run the two bottom bolts on the cover in from the front. If you ever have to pull that cover to change the seal you will not have to pull the oil pan.

1949 Chevy 1/2-Ton
"Sedgewick"
In the Gallery
1989 Caprice