How are on-track values calculated?
On-track values assume that you're active at a steady rate between the start and end of your 'activity period'. You can adjust the start and end times of your activity period in The Real McCoy's settings, which you can access via the Fitbit app on your phone.
Before and after your activity period, you're assumed to be inactive. You aren't expected to accrue steps, distance or time, and your energy is expected to increase at your basal metabolic rate.
To maximise battery life, on-track values are only recalculated once per minute.