A full Windows 10 reset can take substantially longer than a normal restart. Drive speed, recovery files, cloud download, and the Remove everything settings all affect the time.

An SSD and a healthy local recovery image usually finish faster than a slow or damaged HDD. Cloud download depends on network speed. Cleaning the drive for resale takes longer than simply removing files. There is no reliable single time estimate for every PC.
Do not interrupt the process merely because progress pauses briefly; Microsoft notes that the screen can stay black for an extended period. If there is no activity after a long wait, the machine reboots repeatedly, or the disk shows errors, consult Windows Recovery Environment and prioritize the data backup before attempting another reset.
A separate Qiling File Backup to an external disk makes it easier to verify personal files before the long reset begins.
Step 1. Connect a separate backup drive. Open Backup and Recovery and choose File backup.

Step 2. In the folder tree, expand the appropriate drive and select the folders you need to protect. Check game saves, Documents, Pictures, or other locations that matter for this task; do not assume every needed file is in one folder.

Step 3. Choose a destination on another physical drive or a trusted network location. Check its free space and give the task a recognizable name.

Step 4. Click Proceed and wait for the progress screen to finish. Confirm the backup exists, then keep the backup drive separate from the source PC.

Does a black screen mean the reset failed? Not immediately. Allow time for normal recovery and restart activity before diagnosing a failure.
Is cloud download always slower? It depends on connection speed and the condition of local recovery files.
Windows reset time depends on the disk, network, and selected removal options. Prepare a backup and allow normal restart activity before diagnosing a stall.