2 Hours to Make a Berit Mila
Ladaat has a nice story where doctors told a father of a baby boy on the eighth day from his birth - 2 hours before sunset - that the baby was OK to have a berit.
The father got a lot of help from his friends and pulled off getting all the food arranged in under an hour, and the baby was circumcised before sunset.
A commenter on the story makes a good point that all you needed to get before sunset was the Mohel, while the meal could have been eaten at night. But it's a nice story anyways.