Swollen feet

For years I've had swollen feet. Other problems are high blood pressure, some mild kidney problems and diabetes. For the swollen feet I am taking 2 "fluid tabs" a day (40mg) which is the max tbe doc would allow. He has persistantly told me to "elevate" my feet/legs, and I felt that that was too uncomfortable and inconvenient so never bothered to try it. Then someone (not in the medical field at all) told me to do this "elevation" as well. So I did... and within 24 hrs my feet were less swollen. My question now is... what is the best way to proceed... like... how many hours a day is recommended? So far the best I can do is half hourly stints maybe 3 times a day. After 30 minutes it becomes painful and I have to put my feet back down on the floor. No one (the doc) said anything thing like "you need to put your feet up for 2 hrs a day, which could be 1 hour in the morning and 1 hour in the afternoon. At the moment I am just experimenting... trying to put my feet up as much as possible, but it's not easy. It would be helpful to know if there was a "recommended dose" as to what would be the best routine. I believe that if the doc had been a bit specific and suggested some sort of time schedule then maybe I would have started this 'feet elevation' a long time ago. Bottom line... how many hours a day is needed for my feet to be elevated for it to have any beneficial effect on me/my health. Sorry to be so long winded. I do plan on telling the doc about this, but would like to know what other people think. I am going to have to tell him he should have given me specific instructions, just like when taking medication, and he may not appreciate my stupidity.