just reviving this since i replayed the game from the new update: if you're only using the 99 AP cheat (i also used the money, soldiers, and corruption cheats, but those are negligible), it's not possible to get EVERY H-scene in under 80 days.
there's a lot of H-scene events that require you to wait many days to trigger. then there's the ~4 days it takes to move between different regions, and some long story events that are technically optional but feel like the right thing to do, and the 15+ days it takes to bang every girl on Syqua, and if we count the succubus training sex scenes, you find the high succubi late in the game and it takes multiple days of training to get their H-scenes.
...so yeah, it adds up to a lot of days, and infinite AP won't help you reduce them. it might even be impossible to do all this in 100 days