10 hours sounds about right. It took 10 months to write so one hour playing time to one month coding time is a satisfyingly tidy ratio.
Only a person with a vast amount of time on their hands and an unaccountable desire to spend it wandering around the corridors of my mind would do it without any hints, I suspect.
I haven’t actually finished it yet. I’ve made it to the village, but had to give it away to make time to play the other games. When I think back on it, I was pumping it pretty hard (like I was in tester mode), taking notes and drawing a map. I reckon I would have spent about 3 or 4 hours each night for 3 nights, so the 10 hours is starting to sound about right for a normal player.