Maybe a month for rush (but tested) development. Four months means they have other plans for the money and therefore I believe either they will revise that number or there will be a very large lawsuit. Something like criminal conversion or something.

They have around 7 million customers. If the average amount of bitcoin comes out to 0.5 bitcoin (could be more, could be less, who knows?) then that is 0.5 * 375 (current BCH price) * 7 million = around 1.3 billion USD. Maybe it averages out to quite a bit more. But they are saying they need to hold on to a billion dollars worth of assets until next year for 'safe keeping' or because its technically too hard? LOL.