I think about 4x for greenfield development. For example, I implemented this motion controlled game from scratch in 5 days: https://motionparty.net
For this kind of no expectations, for fun development I find AI makes it much easier to develop and test hypotheses. For other styles it's different, especially if the stakes are higher.
For this kind of no expectations, for fun development I find AI makes it much easier to develop and test hypotheses. For other styles it's different, especially if the stakes are higher.