JKR Chat - What was not said - I - Harry's Departure from Privet Drive

[Eustace_Scrubb]

No: HPFGUIDX 92222

Samnanya quoted from JKR's recent chat:
> Adele - Will poor Harry be stuck at the Dursley's all next summer
> JKR - Not all summer, no. In fact, he has the shortest stay in
Privet 
> Drive so far.

Samnanya then added:
 Which to me means that he must leave before his 16th birthday (In SS 
 he leaves with Dursleys 2 days before his 11th Birthday)
 
To which Eustace_Scrubb averred:
  But in PS/SS, Harry returned to Privet Drive after his shopping trip
  to Diagon Alley with Hagrid.  Chapter Six (Canadian pb ed., p. 67)
  starts:
  "Harry's last month with the Dursleys wasn't fun."  That summer,
  the only time Harry wasn't with the Dursleys was from "early the
  next morning" (PS, Canadian pb ed., p. 49) until he returned by rail
  to Little Whinging.  [The movie of course condenses all that and 
  shows Harry leaving King's Cross the same day he got all of his 
  supplies; the more I think about movies, the more I wonder how the
  later ones can possibly make up for the plot gaffes present in the
  first two...after all, school starts on Sept. 1, the prophecy says
  "born as the seventh month dies."  But I digress...]

  So what summer was Harry's shortest at Privet?  Did the Weasleys 
  spring him in COS on his birthday (as the movie shows; don't have 
  the book at hand) or was it later?
  
Cheers,

Eustace_Scrubb