Below is some of the good selection of information regarding to ISinteg and ESEutil. The hard ware, CPU and Memory power of course will make the difference in reality.
The repair runs at approximately 4 to 6 gigabytes (GB) per hour
50-GB database requires approximately 8 hours for repair and approximately
8 hours for the ISInteg process, for a total of 16 hours
The defragmentation option makes used storage contiguous, eliminates unused storage, and compacts the database, which reduces the database's size. ESEutil copies database records to a new database. When defragmentation is complete, the original database is deleted or saved to a user-specified location, and the new version is renamed as the original. If the utility encounters a bad record, the utility stops and displays an error message.
Defragmenting a database requires free disk space equal to 110 percent of the size of the database that you want to process. To determine the actual space required, follow these steps
Make sure that the information store service is not running.
At a command prompt, run the following command:
ESEutil /ms "database.edb"
Calculate the free space by multiplying the number of free pages by 4 KB.
Subtract the figure that you obtained in step 3 from the physical size of the database.
The figure that you obtained in step 4 represents the data in the database. Multiply this figure by 110 %. The resulting figure that you obtain is the space that you need to have available to defragment the database.
Divide the figure that you obtained in step 3 by 9 GB per hour. The figure that you obtain is the approximate time that it will take to defragment the database.
Note 9 GB per hour is the speed at which the ESEutil utility runs. This number is only for reference. The exact number depends on your hardware and production environment.
Full list of ESEutil switches for Windows Exchange
Eseutil /cc Performs a hard recovery after a database restore.
Eseutil /d Performs an offline compaction of a database.
Eseutil /g Verifies the integrity of a database.
Eseutil /k Verifies the checksums of a database.
Eseutil /m Generates formatted output of various database file types. e.g. /mh
Eseutil /p Repairs a corrupted or damaged database.
Eseutil /r Performs soft recovery to bring a single database into a consistent or clean shutdown state.
Eseutil /y Copies a database, streaming file, or log file.
DESCRIPTION: Maintenance utilities for Microsoft(R) Exchange Server databases.
MODES OF OPERATION:
Defragmentation: ESEUTIL /d <database name> [options]
Recovery: ESEUTIL /r <log file base name> [options]
Integrity: ESEUTIL /g <database name> [options]
Checksum: ESEUTIL /k <file name> [options]
Repair: ESEUTIL /p <database name> [options]
File Dump: ESEUTIL /m[mode-modifier] <filename>
Copy File: ESEUTIL /y <source file> [options]
Restore: ESEUTIL /c[mode-modifier] <path name> [options]