Yes, you can apply for the extension of your visa for Oman.

Normally, the processing time takes 3-4 business days. You can opt for express processing in case of emergencies. Express processing takes 24-48 hours, urgent processing takes 7-8 hours and super urgent processing takes 3-4 hours.

Your passport must have a minimum of 6 months of validity and a minimum of 4 blank pages.

The reason behind visa rejection is not often disclosed. However, some common reasons are false or inaccurate information, criminal records, or past unused visa.