After being out with a broken leg, a ___ backlog of assignments had collected in Dave’s desk. voluminous
benign
fortnight
prudent

It's fortnight

Woah, big words (joking).

Here are their definitions:

(all from Oxford Languages)

voluminous - (of clothing or drapery) loose and ample or (of writing) very lengthy and full

benign - gentle and kindly.

fortnight - a period of two weeks

prudent - acting with or showing care and thought for the future

     Using the definition and context clues, we can determine the answer must be "fortnight."

After being out with a broken leg, a fortnight (2-week period) backlog of assignments had collected in Dave’s desk.

Have a nice day!

I see you have "It's fortnight" at the bottom, which looks to be correct.

     I hope this is what you are looking for, but if not - comment! I will edit and update my answer accordingly.

- Heather