How to find out the rollback option on application and database?

In SQL Database Mirroring with automatic failover, What is the rollback option and exact time taken to switch over between the servers when one server is down.
bhuva neshAsked:
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Raja Jegan RSQL Server DBA & Architect, EE Solution GuideCommented:
Exact Rollback/Failover time depends upon how much data is pending to by synchronized from Principal to Mirror node.
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