I can share a general perspective on how a child might perceive their parents leaving for work.
For a child, the earliest memory of their parent(s) leaving for work can vary depending on the individual and their age at the time. It could be as early as infancy or toddlerhood, but the memory might not be fully formed or retained until later childhood. The emotions associated with this experience can differ based on the child's temperament, family dynamics, and the frequency of the parent(s) leaving for work.
Some children might feel a sense of separation anxiety or sadness when their parent(s) leave for work, especially if the departure is sudden or if the child is not used to being away from them. In these cases, the child may cling to their parent(s) or show signs of distress.
On the other hand, some children may not be deeply affected by their parent(s) leaving for work, particularly if they are accustomed to the routine and have a secure attachment with their caregivers. They may understand that their parent(s) need to go to work to earn a living and come back later.
In general, a child's perception of their parent(s) leaving for work can evolve over time as they grow older and develop a deeper understanding of the reasons behind their parents' absence. For some, it may foster a sense of independence and resilience, while for others, it could lead to a longing for more time and closeness with their parent(s).