How many days does the 30-month presence requirement for the US naturalization (N-400 form) represent?

Question

I read on the U.S. Naturalization Requirements Information (mirror):

An applicant for naturalization must [...] show that [they] have been physically present in the United States for 30 months.

How many days does the 30-month presence requirement for the US naturalization (N-400 form) represent? Is it 30*30 = 900 days or 365*5/2=912.5 (~=912 or ~=913) days? Or some other amount?

Answer 1

According to USCIS Policy Manual, Volume 12, Part D, Chapter 4, the physical presence requirement of at least 30 months means at least 913 days.