the game is very hands held for a couple hours give or take depending on how fast u go, i skipped a LOT of the worse sex scenes myself and got to the first choice of the game in rougly 2-3 hours... mind that is including i did stop to 'enjoy' a couple of them before they became a bit tedious, you could probably get there faster if u ignore them all...
on another note, there is a major decision in the game around chapter 2 that will affect game and force lock you into a bad end WAY DOWN THE LINE, its like, double bad end infact, meaning no matter what u choose you get a type of bad end, it really upset me and almost ruined the vn for me. u will have to either have a save for that decision or have to more or less replay chapter 2-4 from the start, so even though its spoilers, ill say this... ASK FOR HELP WHEN U HAVE THE CHANCE, DON'T TRY TO SOLVE ISSUES ON YOUR OWN!
one last thing, happy neige/snow/yuki/etc is adorable! XD