A long time, because in one day I have to work all hours (8.00-0.00), as a result, I have to adjust the time to go to bed and wake up to go to work, given time.
Long time since I had to work all day in 16-hour (8:00 to 0:00), resulting in me having to adjust the time of going to bed and waking up to go to work in a timely manner.
A long time, because one day I have to do all the work 16 hours (8.00-0.00) resulted in the need to adjust the time to go to bed and wake up again to work at the required time.