If you are exporting Zendesk data into another system (such as for an ETL application), you will be working with the various IDs that Zendesk uses to identify users, tickets, groups, and other objects. It's often important to know the length of these IDs when setting up your database's architecture. Does Zendesk cap these IDs at a certain length?
No, these IDs are not capped at a specific length. In fact, they will expand naturally over the time that your Zendesk is in use. You should accommodate for this potential expansion when planning your ETL system, and declare variable types that will work for extra long IDs (64-bit integer types such as long in java or bigint in mysql).