Like several others already posted .... about no time, if you don't count getting into the area. Has happened a few times to me in 50 years or so ... just about like this one in winter of 2004. I say 10 seconds. Slipped into the edge of a food plot where I had planned to sit the remainder of the day .... just in case something might be in the field early. Nada but saw a big 9 pt. bedded up in along the opposite side from me, facing the woods. One shot right at the joining of the back of his neck/shoulders ... never stood up. Done and back at camp in 30 minutes or so.