Just following the logic from Moi Magnus's post saying that there are quadratic factors for science production. That would mean that Marathon should be extended for 900% which of course is absurd. It is 325%, so slightly more than standard game (300%). It also means that 225% for Epic is too much, as the standard is 150%. If you want to extend the game by slowing research by e.g. 10% you need to put ~167%. 225 in Epic slows down research by more than half.