Originally Posted by max_kolesne

The images you uploaded do not appear on the website.

Y-class is TK's full fare. I really doubt that TK would sell a full-fare ticket from OSL to IST at around $650. Your cabin class on the boarding pass would show Y, but the booking fare is usually different. If you are booking the cheapest flight you are seeing on the website, it is very likely that you will only get 12,632/4 = 3158 status miles. You can try booking a semi-flexible ticket which is usually the Q-class, and likely to be the cheapest option for the 100% miles flown, 12,632 miles.

For the hotel, your transfer should be longer than 10 hours, and there shouldn't be any other flight with a shorter connection time.