Supply mode can be entered infinite times, its just a dungeon where you can kill a bunch of monsters for the daily quest. Once any mode is completed (supply isn't even a real mode) the coins gained from that round goes to the npc. The time bonus only enhances whatever the mode is supposed to give you, you don't transfer anything to any other runs. If you do easy and get all silver coins and no gold coins, then that's what you get. The total number of coins you can get per day is 150 (not counting daily quests or extra bonuses). Whatever coins you got in that day from any modes before the limit goes into that total, so you want to do the best mode you are able to when farming coins.
Edit: from previous posts, it would seem hard mode is best.
Thread for the aswan bonuses:
http://www.southperry.net/showthread.php?t=61462
Funny that @
ShinkuDragon would tell somebody else to post his own thread.
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