Note that I don't say I've finished the first draft. Not yet! I have to go back and fill in a bunch of interstitial bits that I skipped over. Plus, I know I need to rewrite about two chapters straight off in order to get a coherent draft.
That rewrite will probably shorten things up, again, so that the first draft will be about 115-120K words. Not bad. I can then see about editing it down to around 100K to tighten things up.