1/3
3 Years of Service
That gets to be the issue, though: if you fully flesh out dozens or more LIs, the bar for "fully fleshed out" inevitably starts to drop. Dev time/player attention are often finite resources, so finding the right number to spread that attention around to is the difficult part. Sure, its not fun when a core set get all the attention and the outer harem, for lack of a better term, only gets cursory details. But the alternative of giving every girl a character arc ends up taking a substantial amount of time to do right.