This is the 273rd most frequent Greek word.
εργασίας
"Εργασίας" means "of work" or "of labor" in English.
The word "εργασίας" is used in the genitive case to indicate the object to which the duration is related.
Η διάρκεια της εργασίας του ήταν οκτώ ώρες.
The duration of his work was eight hours.
In this sentence, "εργασίας" is in the genitive case, qualifying "ποιότητα," showing the kind of quality being discussed.
Η ποιότητα της εργασίας σου ήταν αξιοθαύμαστη.
The quality of your work was admirable.
The word "εργασίας" here functions as a genitive case complement to "ρουτίνα," describing the field or subject of the routine.