Private sector Holidays in Oman have been declared – though its not specified as National Day http://www.omannews.gov.om/ona/english/newsDetails_inc.jsp?newsID=41671
From 1st Muharram (probably on Tuesday 7th December ) until 9th December which is Thursday – so that means return to work for many people on Saturday 11th –which is a bit shorter than we thought
Oman