But pilots with a broader perspective and the FAA are taking this very seriously. See the comments of John Walker, chairman of the APA Aeromedical Committe on the Message page. Three things you need to know. If you have no risk factors, doing it hourly is probably sufficient. The more risk factors you have, the more frequently you need to do it.
Some doctors recommend five minute intervals.
You probably don't need to worry about doing it during takeoff or landing. You have plenty of other things to think about then, and you are more active. How to recognize symptoms. Pilots, like other victims, often struggle for days or weeks with strange symptoms, not knowing what is wrong. During this time you are at risk of sudden collapse.