Ummm, when I did it with my Datsun I had NO IDEA what I was doing and had to use jack stands to hold the car up...Probably took me about 10 hours total because I had to keep running around like a chicken with his head cut off to get more parts to make the job easier lol. Once you do it once...It's hella easy the next time
probably a full day if you've never done it before, and hopefully you don't run into any problems. in my case, some idiot who owned the car before me welded on the exhaust piece that goes from the turbo to the cat, so it took a lot of time to get my tranny out.
give yourself a weekend to work on it just to be safe, and make sure you have the proper jacks and socket sizes with extensions