As of now what is the last location you can move your brothel to?
As of now, the King's Hold, or 28 girls max. At least that's what I'm seeing.
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In my gameplay mod, I'm still experimenting some minor adjustments to the code. At the moment, I have things set now so if you are in positive or negative upkeep territory, the girls will either gain a small amount of energy each day, or lose a small amount if the upkeep modifier is negative. It's not much (even with 200 constitution, less than 10 points), but it'll stave off resting periods and exhaustion for just a bit longer. At the moment I'm pondering boosting that number a bit if the girl is in 'half shift' mode, since she's relaxing for part of the day. I'm thinking maybe 1/3 or less what a girl might normally recover when resting, just need to pick a number that is larger than the number above, but that doesn't make resting completely useless.
The net effect of this is to make boosting upkeep more useful, and also making those 'half shifts' look a tiny bit more appealing.
This will certainly help increase the number of girls available for work on a given night (a girl's energy will last longer between rest periods), which will increase nightly income, hence increasing the pace of the game, so I'm taking baby steps here in my playtesting.
But then, that 'fits' with my gameplay mod. The erosion of reputation each day is having the 'incidental' effect of increasing playthrough time, so this will help offset that, and maybe cut down on playthrough time a tiny bit overall.