This made me curious, so I googled.
https://intensivecarehotline.com/questions/how-long-does-it-take-to-wake-up-after-an-induced-coma/
But that was really long, so I lost interest. Hope it helps.
Thanks, Amanda.
This was my answer for my character's situation.
"Your critically ill loved one is a “Straight forward” and/or “soft” admission to Intensive Care
If your critically ill loved one is a “straight forward” admission to Intensive Care after elective or planned surgery or is a “soft” admission to Intensive Care for a medical emergency on a ward etc… your critically ill loved one should come off the ventilator/ respirator and out of the induced coma relatively quickly within 12- 72 hours!
In those circumstances, your critically ill loved one should be on short acting sedatives, such as Propofol(Diprivan). Propofol(Diprivan) is a sedative that is widely used in Intensive Care to put Patients asleep and it is used as a short acting sedative, meaning that when switched off, your critically ill loved one should “wake up” relatively quickly sometimes within minutes or hours."