Hi @ssams, good afternoon. Thanks for reaching out.
Zone durations are based upon your vegetation, exposure and nozzle selections on a per zone basis. There's a ton of math on the back end, but I'd be happy to review your account with you. Can you send me an email with your Rachio username to email@example.com?
We'll review this and see if any zone attributes need to be adjusted. If you happen to know the square footage and number of heads you have per zone, that would be helpful to review as well.