Epic fantasy tends to run long. Some SF is also of epic length.
But not all subgenres of SF and F run as long as epic fantasy. Some authors who self publish also break long works up into segments that are shorter than normal novels but releasing them much closer together. Sort of like serials.
I've noticed that in the past few years the lengths of the SF and F novels I've been reading tend to be all over the place. Some feel pretty short (as in under 90-100k), while others feel more like the epic length I'm used to in fantasy (over 130k or so). Maybe the popularity of e-books gives publishers more flexibility to publish works of lengths that were "too short" or "too long" when the primary means of distribution was bookstore shelves?
Note, this is simply casual observation, and I am not an industry expert. But even ten or more years ago, when everyone was saying here that a new author could never sell a fantasy novel of over 120k words, most of the debut epic fantasy I read was much longer than that.
It's also hard to estimate exactly how long a dead tree novel is, since page count can be altered by things like margin size, font and so on. There are ways of estimating by counting words per line and lines per page, but those methods don't work as well with e-books, many of which don't even provide "page counts" anymore, and a reader might flip through variable numbers of "pages" electronically before the page count in the lower margin advances. You think it would be relatively easy for a kindle or nook app to give a word count to readers and use that to calculate how much of the book they have read, but they don't. It's always some odd calculation of page numbers or of position in the book.
I wish word counts were something included in the data for novels on the amazon pages, but they generally aren't. I assume the information is kept secret because publishers don't want readers calculating whether they are getting their "money's worth" based on word count?
What I'm trying to say in a roundabout way is don't stress too much about page count when writing a book. Try to make the story as clean as tight as it needs to be without sacrificing plot-advancing scenes, plot and character development. Maybe in a really long novel there will be natural stopping point or points midway through the book, but I don't know if it's a good idea to artificially force it.