That's correct--the demo is only two in-game days.
That's in part because endings won't be written until all the core content of both princesses is written (nearly there), and also because it makes anyone playing less likely to run into bugs--I've only been able to do superficial bug testing since the guts of the game are still in flux and there's a lot of writing yet to do.
I'd make the demo longer and if I had more time to set aside for bug testing, but sadly I work full time so I've focused on the writing.
Thank you for the interest and bug reports!! I think I've found and fixed the problems, but I'll have to be sure after work and I'll try and have the fixes up by tomorrow.