# 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.