I want to clarify my question :

Suppose my company issues me a visa which is 30 days valid to enter qatar then how can i complete my notice period of 45 days in my present job and then join the company in qatar? I want to know whether the job visa my company issues to me will be 30 days valid or 60 days valid or 90 days valid ? (Normally visa is valid in multiples of 30 days)