If I go to Settings - User Profile - VO2 Max to start a manual VO2 Max test, the text displayed on the watch says that you need to complete an outdoor walk or run for 15 minutes. But the test stops and complete after 10 minutes. So either the text telling you to walk/run for 15 minutes is wrong, or the timer is wrong since it is completed after 10 minutes.
This should be fixed since it is a bit misleading.
Cheers,
Eivind Rohne