How many virtual users should we use?

The best guidance is taken from your analytics. If you know your peak hourly visits, the following calculation will determine the number of virtual users needed for your test(s):

V = P / (60/D)

V = The number of Virtual Users needed
P = The number of Visitors in your peak hour
D = The average duration in minutes of each visit

Additionally, you may want to increase V by a percentage that represents growth. Example: if your are using analytics that are from last year’s peak hour during the holidays, and you feel that there will be a 20 percent increase this year, increase V by 20 percent.

V = (P / (60/D) ) + .2 (P / (60/D) )

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