How Many Servers Might a Manufacturing Plant Have On-Premises?

Dear System Administrators,

I'm curious to get your expert insights. Roughly how many servers do you think a large-scale manufacturing plant like Amway might have in their on-premises infrastructure? Also, what roles or functions might those servers typically serve (e.g., ERP, file storage, AD, etc.)?

I understand that exact numbers aren't possible without insider information—I'm just looking for well-informed guesses or real-world comparisons from your experience.

Thanks in advance!