This is another one of those "How long will I live?" questions. There are a lot of variables involved with this procedure. Do you have the equipment needed? Are you experienced? Where is the car - garage, field, junkyard? Do you have air tools and compressor? Is the car stripped or is the front end intact and undamaged? Are you going to use a torch to cut away the mounts, etc.?
A normal pull with the engine and trans in one piece, with the proper tools and a good location like a garage or cement pad, is usually about a 6 hour job with someone that has experience. With a torch cut out type removal it is about two to three hours. Of course a lot depends also on what things you are trying to save from the donor car to re-use like fuel lines, AC parts, brackets, pulleys,wiring looms and sensors, etc. If you have never done this and do not have the right equipment then plan on about 2 days of work and a lot of swear words and busted knuckles. Have a first aid kit available and at least two cases of cold beer!! Also have a lot of Go-JO and rags. Good luck.
Randy