pre lay shed corn

just checked on my adult corn she has done her pre lay shed so im rather excited

ive read its between 4 and 30 days, every website and books say something different, i hope it isnt too long because im an impatient dad lol ps, can i squeeze in a final feed if she accepts it just after her pre-laying shed or is it too risky? it will only be a medium thawed mouse i give her...