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Transfer to ARN is a tricky question as it is a function of many things such as retirements and fleet expansion. For some it took only 5 months.
Roster: Guaranteed 10 days off/month. Days off are actually much higher in reality as you will almost never be called for duty when on stby.
Return flights in the summer. Overnights in the Canaries/Thailand/Venezuela in the wintertime.
Pay: Fixed salary + fixed additionals. 75kr/blockhour in flight pay. Possibility for working on days off are good in the summer, with a nice compensation for your hard work :-)