Depends on the lighting; can be anywhere between instant and 2s. Trade-off is the camera's useless in the dark, takes maybe 1s for the phone to realize this (or

Depends on the lighting; can be anywhere between instant and 2s. Trade-off is the camera's useless in the dark, takes maybe 1s for the phone to realize this (or there's an override button) and falls back to pattern/PIN.