One older schedule says 11-5 and the May 7 was park open at 10 and the spot open 10-5. There is no way for it to be open later than about 6 pm because three is no lighting in that area to handle a night time meet and greet. Expect it to be open one hour after opening or from 10 - 5.
Was just at DL for last 5 days and Pooh's Corner closed at 5:00 every night, even though park open much later. All character areas opened at 9/10 and closed at 5:00 while we were there.