Zachariah served in Jerusalem Temple on 15th days of Tishri 3756. His task ended at 5:33 p.m, the end of 15th days of Tishri 3756 as well as the beginning of 16th days of Tishri 3756.
Meanwhile, house of Zachariah was in Hebron. To determine the approximate time of Zachariah arrival at his house, we need to know the distance between Jerusalem and Hebron along with the approximate travel time on foot.
Modern highway of approximately 41.8 km in length runs from Jerusalem to Hebron, with travel time of about 1 hour 15 minutes by car.
Meanwhile, traditional road of approximately 53.9 km in length runs from Jerusalem to Hebron, with travel time of about 11 hour 35 minutes on foot.
The estimated time is of the modern era, in which the journey from Jerusalem to Hebron is better than journey in 1 AD century, without any beast, such as lions, tigers, wolves and bears. In addition, lighting for night travel in the present day is better with flashlight, which is much lighter than any light source in 1 AD century.
It can be argued, night travel time of 11 hours 35 minutes in modern era may be a little faster than in 1 AD century. Even so, we will use this estimated time in our discussion under assumption that Zachariah had a smooth journey from Jerusalem to Hebron without being disturbed by wild animals and robbers, without running out of oil lamps (bring oil reserves) or without being slowed down by poor roads.