Based on estimates using code commit times and frequency, roughly 672 hours between myself and Dylan (that's 28 days between both; or 14 days each). I only have the data for myself and Dylan because we're sharing code branch; Mikro has also been very busy on the panel during this time, putting in just as equal of work.
There have been many days where I myself have worked between 12 and 16 hours, quite common. Once I am in the zone I don't like getting distracted. There are also days where no code has done; so that number is probably high. We don't have exact time cards so just using my best mathematical skills for nearly 1 am.