Backup Exec verify taking too long

We have implemented Backup Exec 2010 R3, and one job which backing up one of our major SQL databases taking too long. Upon investigation, we discovered that backup of that service takes about 2 hours, but verify is taking about 12 hours.

We backing up to disk folder... Backup disk is provided from EMC storage... We don't have tape library.

Does anybody have clue why verification taking that long?