In general, a working week in Denmark is 37 hours divided between 5 days. Employees in Denmark are usually expected to complete the necessary amount of working hours from Monday to Friday between 06:00 and 18:00.
The question is, when do puppies open their eyes and start this process. The answer is somewhere between seven days to two weeks after birth. It varies a bit, based on breed and on the puppies themselves. When puppies open their eyes, this is just the first step in the beginning of other senses, including hearing.
It will take several more weeks before their eyes mature and their eyesight begins to approach normal. In the same way that the puppies are born with their eyes closed they are born effectively deaf because their ear canals are closed. Relative silence is important for the developing ears since sounds involve changes in pressure that mechanically move structures in the mature ear.