A standard platform or panel bed frame takes about 20 to 40 minutes to disassemble once you have the right tools on hand. Frames with a lot of decorative hardware or an attached storage base can take closer to an hour.
Small folding metal frames can sometimes be moved intact, but most wood and platform frames need to come apart to fit through doorways and to avoid stressing the joints during transport.
Most bed frame hardware uses standard metric bolt sizes that a hardware store can match if you bring the remaining bolt or take a photo with a measurement. Labeling hardware bags by joint when you disassemble prevents this in the first place.
No. Slatted platform frames, frames with hook-and-slot rail brackets, and frames with bolted cam locks each come apart differently, which is why photographing each connection point before you start is worth the extra few minutes.
Disassemble it the night before if possible, since you will still need somewhere to sleep and taking it apart under time pressure on move-out morning increases the odds of stripped screws or lost hardware.