Sorry to jump into someone else's thread here, but I had a similar question--similar, yet different. I will shortly (well, in a couple weeks) be uploading a lightly interactive TWINE version of a novel I wrote some years back, and I'm completely baffled as to what to put on the "average session duration" for it. As it is a full length novel (a bit long for some genres, in fact, being over 100k words) I would expect most people to take a couple of days to read it all. (Whether or not they want to read it all is unfortunately not something I can predict, naturally.) I have no idea how long most people would want to spend sitting at their computer reading it at a time, and as everyone reads at different speeds, I can't even guess how long it would take someone to read a single section of the book/game. Do I try to guess how long people might want to spend reading at a single sitting, or do I put "Days or more" since that's how long it would take most people to get through the whole story? (Unless they decide to stick with an early "Game Over" ending, that is.)
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If you feel like you have a project that doesn’t fit any of the options, then don’t provide an answer. It’s okay to leave a section blank if it’s not appropriate for your work. The option is provided to enable people to filter projects that explicitly provide that kind of experience. Hope that helps.