I have a question regarding peak visitors.

I am wondering if this number of visitors are calculated in one time of the day or in a period of time of the day. 

Cause I thought that these visitors where taken in the busiest period time in one day, for example in my project I have the busiest period from 11:30 to 13:30, in each hour I have 48 peak occupants so I have multiplied this number in 2 (2hours).

I`ll be very thankfull if you can answer and help me with my doubt,

Best regards.