Time block based contracts are where your customer pays up front for a selection of services, and the balance can only be reduced through service call activity.
See an overview here of how to set up a time block contract.
ID835 is an alert that provides a snapshot of your active time block based contracts, showing the unearned balance and hours remaining. This allows you to monitor their activity and make adjustments accordingly, when a client is low or consistently has no activity.
The alert will run once a week, the default schedule is Tuesday afternoon