The clinics are pretty efficient at these procedures, and DH said they managed to get 15 eggs out of me in 20 minutes. I went in, got onto the table, the anaesthetist injected something and I dozed right off. The next thing I new, I was back in recovery and eating raisin toast within 10 minutes of waking up.
From what I've heard, most ladies will have light sedation and this is generally tolerated well. Make sure to rest and drink lots of fluids afterwards!