10, and I completed it already.
This sure is a pricey mod.
I have to disagree completely, this is such a better, more complete game than FO3 was. I suggest not rushing through it, and take the time to go "oh an unfilled triangle, I shall wander that a ways and see what is appertaining". Honestly you'll enjoy it more.
Edit: was maybe a little harsh before I edited it, I blame it on it being late and possibly due to cider lol.