I share pretty much the same train of thought.The way I see it current info points to this direction:I'm starting to think the estimated end date might be pushed up a little with more info being released. If chapter 4 ends next year we should be heading into the dark route by 2027. Sel said the purity routes would take him 2 months minimum to complete and Chapter 6 being the shortest chapter with an estimated 6 months of content Lessons in Love may wrap up by 2028.
Addon: Sel said every character will have a h-scene and the purity routes have guaranteed h-scenes I feel some characters might get their first h-scenes until their purity route.
Chapter 4 ends before summer of 2025>chapter 5 takes 1.5-2 years to finish>dark route which is 6 months>purity routes for the cast which is 2 months each so 2x35 is 70 months minimum so it's almost 6 years OR if purity route is a privilege of thr main cast then it's almost 4 years.
So high balling the numbers we get 2030.Long ass time with plenty of room for sel to massively dissapoint but I choose to believe not in him but in his fear of losing his income, because bad writing WILL be punished harshly