Eating Pies Puzzle

Father Christmas has to visit a lot of homes on Christmas Eve when he is out delivering presents. He usually gets a glass of sherry and a mince pie at each house too. Now, Father Christmas can manage the sherry, but finds eating all those mince pies quite difficult. So Hungry Horace helps him out.

Last year Father Christmas finished his rounds with lots of mince pies to spare. He gave 25 million (25 000 000) to Hungry Horace. It takes Horace just 10 seconds to eat a mince pie. How long did it take him to eat all 25 million? An hour? A day? A week?