Anoxia recovery times
I recently did a three-hour flight in a light plane, taking off from 2700', flying mostly at about 8000' but with an hour or so at 11,000' up to 30 minutes before descent and landing at 3700', which is the altitude I live at. I was extremely tired after landing and I wondered if I had become slightly anoxic or if I was just tired after a very turbulent flight in mountainous terrain on a hot day.
Is the recovery from anoxia rapid when descending to lower levels or are there delayed effects?