If you are a first year master student, February can be a good time to think about extending your residence permit, as you may start applying as early as six month before your residence permit expires on 31/08/2018. Trust me, you would want to do it sooner rather than later!
HOW LONG DOES IT TAKE?
The migration agency in Sweden will tell you that the process differs from case to case. It is true, though I can provide you with my own the timeline, which might be typical for a student visa extension:
I started my application in the middle of May and the entire application takes as long as 3.5 months for me. As summer is usually the peak of all kinds of applications at Migration agency (“Migrationsverket” in Swedish), it is really important not to apply at the last minute!
Online application is the most common and the easiest way to extend your permit. You will be asked to: