GoF timing

[Sam Brown]

No: HPFGUIDX 2225

Judy said: And then how long did it take Dumbledore to realize that 
Harry had been carted off by the fake Moody? To me it doesn't seem 
like this whole last bit of Voldy and then Moody could have taken 
much longer than half an hour. Perhaps 3/4 hour.

Dumbledore realised that Moody was an impostor as soon as he 
(Dumbledore) saw Moody take Harry away. Dumbledore explained to Harry 
something along the lines of : 'I knew he was fake when he took you 
away from the crowds, which were safe' or something like that. The 
time it took for Moody to 'reveal' himself to Harry was probably 
Dumbledore rounding up Snape and McGonagall (as all three of them 
appeared in the Foe-Glass).

Judy, you also pose an interesting question: DID anyone know anything 
was wrong before Harry returned with Cedric's dead body? I don't have 
GoF on hand so I can't check, but I believe that when Harry returned 
there was a definite atmosphere of unsettlement at Hogwarts. People 
knew something had gone wrong, but they didn't realise quite how 
wrong things had gone. Remember when Harry returned with Cedric dead 
people were absolutely shocked, as you would be.

Remember that Sirius had been expecting something like this to 
happen, so although the nature of Harry's kidnap and return was a 
shock to him, the fact that Harry was temporarily kidnapped was not. 
So the moment Harry disappeared Dumbledore (being in contact with 
Sirius) probably would have gotten worried.