Avarage staying period is calculated by the total staying time devided by number of visits.
To calculate total staying period (TSP) for one day you need:
If the observation tours has been done regularly throughout the day:
Calculate the avarage number of patrons (ANP):
Avarage Number of Patrons=(obs1 + obs2 + .... + obsN) / N
Total staying time- measured by minutes pr person - is
TSP = MIN * ANP
Avarage staying period is
ASP = TSP / (number of visitors)
If the observation has been regularly all days, you can add all opening hours and all observations together, and calculate TSP and ASP
If the time spans between the observations are nonregular, the calculations are a bit more complicated. Following is a constructed example with library NoName:
NoName library is open from 10 to 19, had 500 visitors, and the observation numbers were:
The day is devided in periods, starting in the middel of two rounds, and use the observations to estimate avarage number of persons:
Avarage staying time for this day:
Several days:
Calculate by adding all staying periods devided by number of visitors.