Working as a housekeeper could be a very busy task.
Cleaning, housekeeping, cooking, shopping, ....
The time you need to finish all point of the work every day - if there is not enough of staff, you won't have free time.
As soon as you are working 12-15 hours or more, there is a second person needed for a task.
It depends on the surface of the household, how many persons and animals; how many staff will be needed.