You have 90 days from the date your passport was issued to report that you have not yet received it in the mail. If you do not report the non-receipt of your passport within 90 days of the issue date, you will be required to reapply and submit the full passport fee.
The best time of year to see the Northern Lights in Iceland is between the months of September and March. To be in with a really strong chance to witness the northern lights a cloudless, clear sky is the main requirement with the outside temperature being cold but dry.
The Aurora Borealis, known as the Northern Lights, happen all year round, but you need dark, clear conditions in order to see them. Generally, the prime seasons for viewing the Northern Lights are early autumn and spring. Most Northern Lights eruptions occur between 6pm and midnight, particularly around 10 to 11pm.