imdavid555

Surface scans are disabled for CloudDrive disks by default.  But file system scans are not (as they can be helpful)
You can disable this per disk, in the "Disk Settings" option.
As for the length, that depends on the disk.  aand no, there isn't really a way do speed this up.

If you double click on the drive, and open the "File system health" section, you can reset the status. Click on the button with the green circle to do this.
 
But this will cause it to rescan the drive, sooner or later (depending on the option you chose).