Zone minutes are higher than my workout duration

[Drrpevans]

My workout lasted 17 minutes, but says 27 zone minutes?

Moderator Edit: Clarified subject

[alexthecat · Accepted solution]

@Drrpevans this is related to how Fitbit calculates Active Zone Minutes. Each minute in the Fat Burning Zone is worth one Active Zone Minute. Each minute in the Cardio and Peak Zones is worth two Active Zone Minutes. So, you must have exercised hard enough to get double the Active Zone Minutes for part of your workout.