kinda hard to answer, the base " engine" i made took me around 3 months, but i did a while ago, like 2021 i think, each stage here takes me between 2 weeks or a lil over a month to finish, longest by far was kuro, i think this last update (mihawk) was 3 weeks
i made it on godot, i guess engine is not the best word but more like a general framework for the battle system in general that's easily customizable (by me), which greatly decreases the time it takes for me to develop an idea of mechanic
