1 Bi monthly. One just dropped, a patch may come out in a day or two fixing some of the worst bugs. Otherwise not until Jul 31-Aug 6.
2 It likely never will be bug-free, not until it's a finished project. That is unlikely to happen but if there -IS- a chance of it happening it could be by the time Locke Costa (Hi Locke, love ya even if you do come off as getting angry) transfers... transcribes? Re-releases? the new entire old game into the SU Rebuilt - No timeline for that but word is Locke has been swapping the game over quite quickly. Given the game has 4 / 13 heroines finished and SunsetRiders7 keeps coming up with new ideas and events the best guess for game completion would be early 2020 at the earliest (I personally hope it never ends but that's just me)
3 No. Tala and Roulette being busy and the girls ignoring you (or smothering you with crazy love or inane worship - see specific girl) is part of the innate randomness of the game and the only thing keeping it from being a straight storybook.
Feel free to ask anything else, I've a soft spot for guys who've commissioned cool fanart with their OCs on HF