Scan takes too long time.....Fallow the below steps

The resolution might be set to high. Check and change the resolution settings to the correct settings for the scan.

The software is set to scan in color. The printers default is color, which will take longer even when scanning a monochrome original. The setting can be changed to scan in gray scale or black and white within the printer software.
There might have been a print job sent to the printer before you started the scan. When this happens the scan might be slower due to the memory being used by the printing and the scanning.

The scanning computer might not have enough available resources. Try closing any used applications. If the scan is still to slow try rebooting the scanning computer. Antivirus, spyware and firewall software might also cause slow scanning.