The answers come from
Anesthesia & You... Anesthesia for Ambulatory Surgery, an informational document prepared by the American Society of Anesthesiologists through the cooperative efforts of the Society's Committees on Communications and the Committee on Ambulatory Surgical Care.

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When will I be able to go home?
This will depend on the policy of the surgery center, the type of surgery and the anesthesia used. Most patients are ready to go home between 1-4 hours after surgery. Your anesthesiologist will be able to give you a more specific time estimate. Occasionally, it is necessary to stay overnight. All ambulatory surgical facilities have arrangements with a hospital if this is medically necessary.