Leslie
I have taken it only when I fly and the two days after arrival during the period I was to adjust my clock to. Going to Europe from LA, I take it after dinner service - about 7 hours before landing. From Tahiti on the red eye, took it an hour into flight and woke up in time for breakfast. We don't fly 1st ofr BC unless we can use mileage rewards, and lately, that hasn't happened.
I have 10 mg and woke up so that I could function a full day at destination. I won't fly far without it.