The game has an in-game timer, but the problem is that the credits don't show what that final time would be. We can actually see what that time is however. The game's auto save system saves after every screen transition. If you finish a full game run, you'll notice that if you use the auto save directly after the credits the game will put you in the final cutscene. This means that the game can properly time your last makeable input. It starts from the moment you press "New Game" and ends a frame before the last cutscene. Using in-game time also levels the playing field for PC players. Usually if I have a better PC than the next guy, my load times will be a lot faster and will make me faster by default. In-game time is generally more competitive and fair for this reason. This also works for ILs as well as the auto save will save and record the time right after you enter the transition between chapters. I personally feel this is pretty fair, but I wanna know what y'all think. tl;dr The game auto saves right after transitions and we can use that auto save time to get an accurate in-game final time from the game. This works with full game runs well. If we wanted to do IL's we need to get the game to auto save during the chapter transition and then subtract that time with the auto save time from the next chapter transition.

RPG Maker games do not have in-game time and in addition the in-game times are inaccurate in RPG Maker games like Mad Father Remake on PC and in other categories checking the in-game time is impossible because in other endings you cannot see the exact time you have in the game

If we timed to last input and checked the autosave like in my 29:40 you can indeed see the final in-game time. I tested a few things and I do agree that there are times the in-game time seem weird but I wouldn't call it inaccurate. Like run a RTA timer beside the in-game menu and watch the timer in the bottom left hand corner. Spam the pause menu and the in-game time starts to lag behind slowly because there are frames of inactivity that it's taking out. I just think it needs to be tested more.