Studies have debunked the lock down phase. Some biologist are now saying that 24 hours is the upper limits. On average less. That helps explain why many does have twins fathered by different bucks. The only buck/doe I ever saw breed, was a wham bam thank you ma'am. Buck and doe happened upon each other , from different directions right in front of me. They did the deed and then went their separate ways. Whole show was less than 5 minutes.