In reality my moves take more than a second, and I know I don't make perfect moves. So, over 4.5 hours.
2) The fact that the game doesn't drop only 1-tokens means that the time is shorter - again, since the 'total' accumulates faster.
That being said, the game is much, much longer than the previous ones - 2048->16384 alone increases the time by 8, and starting with ones instead of twos doubles it again.
Author should add this 4.5 hour estimate as a nice big warning message.