Harry didn't realize what he was so pleased about until the Potions lesson about two weeks after Dumbledore and Hagrid had left, when, sitting right behind Malfoy, Harry overheard him gloating to Crabbe and Goyle.
" It's two weeks till full moon, " Mr Weasley reminded her quietly. " They've been talking to him this morning, the Healers, you know, trying to persuade him he'll be able to lead an almost normal life."