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Does this require everyone to be at a computer for 2 hours straight or can it be played asynchronously over the course of a day or 2?

Words with friends does this well, except I don't care about scrabble.

If you keep the link, you can always come back to the game, the state will be persisted, as long as you use the same device.

But yes, there are some features missing to better support asynchronous play, i.e. sending an email or notification when it is your turn