Q: Restoration of backup data.

Generally, the amount of time required would vary depending on the capacity

of the drive involved and total number of files, etc being restored.

And depending upon what the exact question or issue is, the results may vary.

Several generally good-to-excellent informative topics are on linked page:

• Apple OS X and Time Machine Tips:

http://pondini.org/OSX/Home.html

Good luck & happy computing!