If opening the door shuts down the emitter, then there'll necessarily be a brief period of microwave emission. Even if the emitter's power goes to zero instantly (it doesn't) then the microwaves that have been emitted and are still bouncing around can escape, that'll be quite a few nanoseconds.
I suspect the mechanical-style door switches on microwave ovens require some amount of door movement/opening before activating. The door is also I believe a part of the RF shield that contains the microwave radiation. As it opens and allows a gap before the off-switch activates — this seems likely your window of microwave leakage — not so much the residual waves that might linger after the device is powered off.
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Quickly enough for what?
If opening the door shuts down the emitter, then there'll necessarily be a brief period of microwave emission. Even if the emitter's power goes to zero instantly (it doesn't) then the microwaves that have been emitted and are still bouncing around can escape, that'll be quite a few nanoseconds.
I suspect the mechanical-style door switches on microwave ovens require some amount of door movement/opening before activating. The door is also I believe a part of the RF shield that contains the microwave radiation. As it opens and allows a gap before the off-switch activates — this seems likely your window of microwave leakage — not so much the residual waves that might linger after the device is powered off.