Disk Defragmenter might take from several minutes to a few hours to finish, depending on the size and degree of fragmentation of your hard disk. You can still use your computer during the defragmentation process.

Does defragging speed up computer?

Defragmenting your computer helps organize the data in your hard drive and can improve its performance tremendously, especially in terms of speed. If your computer is running slower than usual, it might be due for a defrag.

Why is defragmenting taking so long?

Defragmentation really depends on the hardware you are using. The larger the hard drive, the longer it will take; the more files stored, the more time computer will require to defrag all of them. … After each pass, your hard drive becomes more organized and faster to access.