If the time entries from QuickBooks Online are syncing to CORE with the wrong time increments, this could be because of the settings for time increments in CORE. To fix this:

1. Open the side menu > Settings.
2. Under Time & Expenses > Time Entry, adjust the setting for 'Smallest time increment for time entry(s)' to the appropriate value. Changing it to '0:01' allows time entries to be synced by the minute, for example.
3. Save your settings.