Well if it was 55% at the launch of the website on 12/22/2015 and it took until 2/18/2016 for an increase to 64% the rate it's developing is 9% every 58 days. With 36% remaining this means it will take 232 more days for the bar to reach 100% at the current rate it is going at.   However I think (and deeply hope) the devs just forgot about the percentage and/or it doesn't represent the reality of development.   Any feedback from them in regard to this would be great (though as of recent they haven't said anything.)