That might explain the first sentence of Albus Dumbledore's aftermath in Chapter 63: "It might have been only fifty-seven seconds before breakfast ended and he might have needed four twists of his Time-Turner, but in the end, Albus Dumbledore did make it."
Or perhaps not, since there would presumably be more than 4 hours between 2am (when Trelawny heard the prophecy) and the end of breakfast.
Suggestion: the person who memory charmed Rita Skeeter was Gilderoy Lockhart, who was the most famous master of Memory Charms ever mentioned in canon.