You have to renew your visitors visa monthly but only have to leave the country every other month. Otherwise you renew it at the immigration office by the airport for QR 100 on the months you do not leave the country. As far as I know you are able to do this indefinately as I did last year. . .Be careful about getting a residency permit from your employer until you feel stable with them as there can be alot of complications if you are not happy with your employer and intend on leaving that job before the year is over. They have the power to cancel your residency permit and you will not be allowed to seek employment in the country for 2 years. Although it is required to work in the country, just try to put it off as long as you can until you are sure about the job.