I had surgery last year and I believe I was out for a few hours. when I woke up I could definitely sense that some amount of time had had passed. I haven't felt

I had surgery last year and I believe I was out for a few hours. when I woke up I could definitely sense that some amount of time had had passed. I haven't felt that sensation during quicker surgeries so maybe our perception of how quickly time passes is changed and slowed down?