I tried to play as a stand-up citizen guy (No filming, no lewd stuff to Yuna).
it took me 87 loops just to get all three stats + relationship to max, 10 out of 10 would rather be a creep.
Jokes aside, I think that this could be pretty easy to do. From my experience, currently jogging can generate more money than filming (until you get a few expensive upgrades). So, if you just jog every day and buy and read magazines when you can, you should be able to get to max stats and stack some cash pretty quickly. IIRC, you can get around 20k per every jog from the park to the lab. So: Cook to get the energy regen buff, spam jogging, always buy magazines, save up for exp upgrades, rinse, repeat. Gymcel playthrough is real and is a solid strategy, actually.