Virtual User Minute is the amount of time a particular virtual user is simulated to load a target resource. Or put it in another way, Virtual User Minute is a sum of the total number of users simulated per each test minute.

For example, 12 virtual users are used for Load Step Stress Test of 5 minutes duration. The load curve is specified in the following way: two users are simulated from the test beginning, then after 2 minutes 10 users are additionally simulated. So we have the following distribution of Virtual User Minutes (VUM):

  • 1st minute – 2 users 
  • 2nd minute – 2 users
  • 3rd minute – 2 users + 10 additional users= 12 users
  • 4th minute – 12 users
  • 5th minutes – 12 users per each minute

The total VUM is a sum of the number of users calculated per each minute of the test: 2 + 2 + 12 + 12 + 12 = 40 VUM.