It usually takes between 1 hour and 2 hours to wake up completely after a general anesthesia. The time needed to wake up varies depending on the length of your anesthesia and the medications used for it. Recovery also varies from one patient to another (young and healthy patients tend to recover faster than older patients with several chronic diseases).

General anesthesia allows the realization of a surgical, obstetrical or medical act (endoscopy, radiology...) by plunging the patient in a very deep sleep. The anesthesia ensures the comfort of the patient by avoiding pain and the memory of the procedure.
Throughout the general anesthesia, you will receive medication to maintain the anesthesia (anesthetic, painkillers...). 
The anesthesiologist is present at your side throughout the procedure to ensure your safety.
Before the surgery, you will be required to consult an anesthesiologist. The anesthesiologist will review your medical file and ask you questions about your medical and surgical history, your allergies, etc. 
The anesthesiologist will prescribe the check-ups that he/she deems necessary according to the planned intervention and your state of health: blood tests, consultation with a specialist or imaging.
At the end of this consultation, the results are recorded in a written document and you will be informed about the anesthetic technique, the possible risks and the instructions to follow.
Although they are usually temporary, their persistence should encourage you to consult your doctor:
Upon awakening:
A few hours after anesthesia:
Once you are awake, you will be placed in the recovery room where a nurse will monitor your vital functions and check for immediate postoperative complications.
The time between the anesthesiologist stopping the administration of anesthesia and you opening your eyes depends on several factors, but in practice it takes between 5 and 15 minutes.
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About 38% of adult patients suffer an adverse event during or following their surgery, researchers reported Wednesday in the BMJ.
Nearly half of these complications result in serious, life-threatening or fatal harm, results showed.
60% of the complications were potentially preventable and 21% were definitely or probably preventable, researchers report.
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