Norwegian already offer Scandinavia to DXB on guess what 737-800. Recently as yesterday announced HEL-DXB daily.
Block time according to Amadeus is 6h55. Great circle has distance of 2819 miles.
Comapre it with TOS-LPA - block time 7h00 and a great circle of 3191 miles. Also operated on 738 with Y186 config.
As an aside TOS-LPA is also operated by TCX Scandinavia on A321
Edit- obviously doesn't take into account crew FTL etc