Yeah, it's about 7-9 hours total so that might be short enough to want to see it through. IIRC, there's very little in the way of side content, it's puzzles, some combat and character development along a fairly linear path.
There was a couple bits I got stuck trying to figure out how to proceed because the puzzles were a little more convoluted then I would have liked but I think otherwise it proceeds at a fairly good clip and 7-9 hours feels JUST long enough for what the game is trying to do.
I wonder if the "convoluted puzzles" was on purpose, to try and replicate the squirrely logic that people with schizophrenia and similar conditions have? I mean from my own personal experience with a brother who is massively schizophrenic, the various things we would see him doing, when he was totally off his meds, were....well, bizarre would be a kind way to put it.
Things like, he believed in some thing (that is apparently a "real" mythology, given I saw these very beings mentioned in a Jim Butcher Dresden File book), but that demons can enter our world from right angles....yes, you read that right...right angles. Like, ANY place where 2 planes meet at 90degrees, is a point of entry for this demons...because reasons. So he would put up little ward symbols pretty much any place he saw a right angle (corners of doorframes, lightswitch panels, power outlet panels, EVERYTHING). He also collected, at one point, a series of shot glasses, and he would put a single coin of each denomination in the shots, along with scraps of bible passages, and news clippings. Again, for what reason I have no clue, but he had 20 of them in a precise row in his closet one time. He would tear out passages from antique books my grandmother had (that were apparently very valuable until he destroyed them, include pages from current newspapers that he felt were connected in some way, and mail them, in HUGE envelopes just packed with stuff, to the president of the US (at that time I think it was G.W.Bush), he did this so frequently that the secret service actually showed up at my grandmother's house, to discuss the packages with my mom. So that was a fun day, hearing about how she had to explain away the crazy mail her son was sending the president.