Summary
This article describes the limitations you should consider when working with ApexSQL Audit.

Description
The maximum number of audited distributed instances
There is no specific limit on the number of auditing instances (remote SQL Servers) that may be audited. The maximum number depends on your environment, the number of transactions executed against audited servers/databases and network bandwidth. The more distributed instances, the more likely it may be for you to encounter performance problems, as a large number of packages transferred through your network can cause bottlenecks.