Poker: How many outs will win you the hand?

The Turn card has been dealt and your hand (9 10 suited), just picked up a few more straight outs besides the Flush outs that we already had on the Flop. The villain still leads with a pair of sixes and has some additional straight outs too. Although we have not connected with the board at all, but we still have a fair chance to take down this hand on the River. Can you figure out the exact number of outs needed to win this hand on the River?