I've done a number of genres, but I don't work on nonfiction, horror, or erotic novels.
In general, I'm pretty flexible as I've been an avid reader of countless novels since early childhood.
If you have something specific in mind, just ask and I'll decide whether I'm willing to do it.
As for length, preferably 50 pages or less, unless you're actually hiring me.
The idea is roughly three short to medium chapters.
Since I'm working for free, length is flexible and I might do more or less according to time and interest.