Welcome to FT and to Continental!

The way I read what you wrote, it sounds to me that you have to complete the RT before August 31.

If you fly a lot, 2,500 miles won't seem like a lot. How many times are year will you fly between OSL and EWR? Will you fly in coach or in BF. If you fly in coach, will you purchase an H or higher fare?

I ask these questions because you could rapidly move into the Elite ranks of Continental. I think you'll rack up close to 7,400 miles per round trip. If you can plan your trip in advance (I think it's 45 days or two months), you can also book a BusinessFirst fare as a Z class, for somewhere close to $2,500.

It sounds like you won't get those 2,500, I could be wrong, but if you fly a lot, CO will throw a lot of mileage-earning opportunities your way.