There's about 50 pounds of it a foot to my right, in about 4 different stages of being sorted.
Using averages of 6 different broad families of piece types (bricks, plates, slopes, large pieces, technic, minifigs/flora/fauna) weighed and approximated by mass, I have about 12 000 pieces. This is not including several sets I have on my shelf which are already assembled, and the Technic Mobile Crane II which was jointly bought by my two brothers and I, which has about 2800 pieces.