EDIT: 4 hrs 30mins after request, BTC withdrawal has been received in my wallet.
You lucky. Receiving on the same date is quite fast
Are you implying that Gox is systematically delaying Bitcoin withdrawals?
That would be an intentional delay, as there are no technical limitations (except for rare cold storage visits) for broadcasting transactions immediately.
(I just ordered a BTC withdrawal and indeed I'm not seeing the transaction yet.)