I have basically done everything possible in this version. "Professional" levels for all the stats, all the traits, all the outfits, all the bar stuff and 12.5k for buying elves and I bought Jin. Im on day 323, thats not as efficient as i could've been. Forgot about Ashleys shower event, so i had to spend a few weeks on that to get her thigh-jobs and I didn't save up for the bar as well as i could've done since i bought stuff to advance the storylines (probably got in around day 60). I didn't do the photo shoots until quite late as well. So, someone more organized than I am could've probably done it in 260-280ish days probably?
But getting the money does take time. 35 dollars a day from the girls (all the girls in the hotel) and lets say you do 1 photo shoot per day and it get 25 dollars on average, so that is about 420 dollars a week. I usually get around a 1000-1200 profit on the bar (fully upgraded). So, you can reasonably make 1,500-1,800 a week. 1500 dollars a week will take you about 8 weeks (56 days) to get 12k. So it goes pretty quickly once you get it going, it takes more time to fully upgrade the bar than it takes to get 12k after its upgraded I think.
So, lets say you buy the bar on day 50 (sooner than i did), then another 30 or so days to get it fully upgraded, then 60 days to get profits, then another 60 days to get 12k. total time is 200 days, and thats without buying anything else. so my 260-280 day guess from earlier is probably accurate.
Interesting thing i just found out. Lets say you get 560 dollars a week (rent + 2 photoshoots per day) , that will take about 21 weeks to get 12k. 21 weeks is 150 days.......so It might be more efficient to not buy the bar at all, or its pretty close.
*Note, its entirely possible im terrible at math and that is all way off.