If you usually work on maintenance or recurring jobs, you should consider start using the Hour stack.
It's a sort of "customer credit" and, if you set the hour stack color, you can get a visual impact on how much "credit" a consumer has left.
Hour stack ID
Is this record published?
Is this record billed?
Invoicing is enabled on professional version only.
Customer linked with this record
Brief description of the hour stack
Total hours dedicated to this hour stack
Hours spent with on this stack; these are fetched directly from the activities.