Is there an ideal duration for meditation to treat severe anxiety?

I am willing to commit time, but I need to know the optimal duration. Is 10 minutes too short, or is an hour too long, risking burnout? Does the time commitment truly correlate with the effectiveness needed to treat severe, generalized anxiety? My name is Nikhil. My DOB is 10th December 1987, born at 10:00 AM, in Kolkata.