I'm considering going for a mileage run in J or F and wondered if anyone has any thoughts on how many stopovers I should plan for. The great thing about premium cabin is that you can use it as a flying hotel - but there must be health advice given to those working on planes as to how much time they should allow between flights to allow their bodies to recover (though this will be skewed to them working too!!)

Any feedback, esp based on medical evidence, appreciated.