I thought you were recommending having that much in your system before you get on board. But drinking a gallon while on board can still get you up quite a few times during the trip.
Just look at the number of people who are constantly getting up to go to the lav now. Even on flights less than two hours, the lines can get long. Most people in first class go infrequently, they plan ahead because they know how bad the lavs can get especially after ten people in coach decide they’d like to try up front.
>> But drinking a gallon while on board can still get you up quite a few times during the trip <<
It’s really not so bad for me. And drinking prodigious quantities of water, plus avoiding alcohol and caffeine, has been my formula for avoiding jet lag after many flights of 20+ hours from the USA to SE Asia. Before I discovered the problem of dehydration, my jet lag could last as long as ten days. Now it lasts only a day or less.
But anyway, getting up a lot during a long flight is maybe the best way to avoid blood clots, also known as DVT or “deep vein thrombosis” — something that can be a huge problem.
For example, I was told by a gal who worked at the American Embassy in Beijing that a major function of the Consular Section there was to deal with elderly American tourists who either died or were hospitalized due to DVT after long flights to China. I’m willing to bet that most of those poor folks didn’t get up often enough during their flights.