Expenditure (Noun)
Definition:
- the act of expending something, especially funds; disbursement; consumption
- something that is expended; expense:
Encountered from Reading Lucy
“But that seemed a strange expenditure of time and energy, given that I was supposed to be researching the Brooklyn Navy Yard”
I understand this word now because the author was too into reading Lucy’s letters that she lost track of time.
Source: Dictonary.com