Take it all on your normal schedule, using local times.
I am taking NatureThroid (T3 and T4) and Synthroid...
If you're only on levo (T4) being off a few hours on the dosage should not have any adverse effect, because it has such a long 1/2 life.
Oh, ok. I hope it does not affect too much my body's rhythm. Thanks!
You may get off a bit, when getting to Europe and when coming home, because of the time difference. Take your medication, as usual on the day you leave home, then when it gets to be 6:00 am, where you're going, take it just like if you were home. I always take mine "local time".