It varies a lot, depending on your age, sex, health, oral hygiene, and the difficulty of the extractions. You'll definitely be sore and perhaps a bit swollen for a few days after the surgery, but if you keep everything clean and pay attention to the post-operative instructions you should be fine. If you're a smoker, give it up for at least 3-4 days afterwards - smoking wreaks havoc with your ability to heal properly and will irritate the sockets.
Full healing will take weeks-months, but you should start to feel better after a few days. If the dentist has recommended a week off work, take a week off work.