High-Fidelity Mocks: How many per day/hour/average?

Fellow UI/UX Designers,

Is this an impossible question to answer? How many high-fidelity mocks should your employer expect per hour/day/average etc.?

No two mocks are the same, some small features can take 10-20 minutes to draft, but some require HOURS/DAYS of research before creating a production-ready mockup.

I've looked around and cannot find a good answer for this (if one even exists).

I currently have 4 days to complete over 100 mocks, and I really want to explain how impossible/ridiculous this request is with some data. Thanks