Nobody will track properly that many girls , it's not a matter of hiring help , even if it would likely be better . Unless you give a turn to a different girl each scene , they'll never get proper airtime , and if you do that the progression stops and they all feel irrelevant . It should have been obvious that it's impossible to juggle from the early days of the game , when he had "72 hours" day ingame lol .
Remember when MC having date with 4-5 girls in a single night , each like at least one hour , while traveling from one location the next , even taking walks ... or right in the midst of moving houses ? That's exactly what having so many in a harem does to your game .
The "big harem power fantasy" that do it right (like again , but mostly because fresh for me , "The long Road Home") still got less people within the game , and add those characters at a more controlled pace . And even then suffer from their MC having some weirdly intense "CEO/Mayor of a city" schedule