Duration of visit

Staying period

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:

opening hours (in minutes =MIN)
number of observation tours (N)
number of observations from each tour (obs1, obs2, .... obsN)

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

Nonregular observations

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:

0930 - 10 persons
1030 - 22
1200 - 19
1400 - 28
1500 - 27
1630 - 15
1800 - 12
1850 - 6

The day is devided in periods, starting in the middel of two rounds, and use the observations to estimate avarage number of persons:

10 persons from 0900-1000 : 10 hours of staying
22 persons from 1000-1115 : 22 * 75 minutes = 27 hours 30 minutes
19 persons 1115-1300 : 19 * 105 minutes = 1653 = 27 hours 33 minutes
28 persons 1300-1430 : 28 * 90 minutes = 42 hours
27 persons 1430-1545 : 27 * 75 minutes = 33 hours 75 minutes
15 persons 1545-1715 : 15 * 90 minutes = 22 hours 30 minutes
12 persons 1715-1825 : 12 * 70 minutes = 14 hours
6 persons - 1825-1900 : 6 * 35 minutes = 3 hours 30 minutes
SUM: 181 hours and 18 minutes

Avarage staying time for this day:

(181 hours 18 minutes)/500 =
= (10860 + 18) minutes/500
= 21,8 minutes

Several days:

Calculate by adding all staying periods devided by number of visitors.