Well... Since this became mostly a kinda slice-of-life game, it could theoretically go on forever (even if Mr. DPC dies, if he has children, they could carry on his legacy), but, when it comes to plot -- and, if actually still there's one, it's a matter of debate, but let's not touch this point yet --, it could perfectly end in 16 episodes. In fact, about a year and a half ago I
posted that Mr. DPC seemed to be following the "Save the Cat" recipe. I still think it's so, thus, six episodes are more than enough to wrap around everything that's going on right now. Of course, if he decides to end after this cycle, there'll be people pissed off that some things could have been deepened; and, of course, after this cycle -- as it happens with many TV shows -- he can decide to continue, creating new plots (or mini-plots, side plots, etc.) and keep going on until he gets bored. But, according to the image in the post I linked, he's exactly in the middle of the third quarter, reaching the "dark night of the soul when all is lost". Since, as it has been mentioned, he has to add comedy and debauchery, it may happen in the next or in episode 12, but the time is coming to shit hit the fan--and Riona's kidnapping was the tell to it. I think the downfall will happen at the end of episode 11; in episode 12, Mr. Tremolo, after the tribulation period will start to prepare his revenge against his enemies, which will start in episode 13 and, probably, will last until episode 14; and the last two episodes will serve to wrap around the side plots and romance paths. Whether it will continue after that, depends on Mr. DPC's mood--if he wants to enjoy his fortune or continue with the game.