Recently a feature was added to let users pause the timer in Inbox. This feature seems to be currently bugged. When starting the timer, pausing it and waiting for some time, then un-pausing and tracking your time, it will track time for the whole period since you started the timer, as if it was never paused.
For example, to test I started a timer, waited 15 seconds then paused it. After waiting 30 seconds I started the timer again and tracked time after 15 seconds. It should have tracked 30 seconds, but it tracked the full minute instead.