Most YA novels fall (from what I've read) between 60,000 words and 100,000 words. The good news is, if you're a little over, or a little under that's usually okay. But try to aim for those guidelines. I've heard that 40,000 is usually too short, and over 100,000 is usually way too long...but we're writers.
There are always exceptions to the rules.
Usually when I start writing, 60,000 is my end goal. Sometimes, I fall a little short of that, but that's okay...rough drafts (for me) are usually significantly shorter then the ending product. But it's nice to hit 30,000 words and say "I'm half way done! Wooo!"
So, as of today, I've finished My Sister's Memories (woo! Huray, my NaNoWriMo project is finished!), however, I'm at 54,338 words, approximately 200 pages. Which even to me, feels a little short. (There is one more scene I technically need to write in, but I'm really tired right now, and I can feel my creative juices dwindling). The good news is, a round of editing will probably give me about another 10,000 words.
Just wanted to pop in and tell you guys I finished, and throw some length guidelines out there for those of you who weren't aware of them.
Have an awesome night!