Took husband over 4 hrs to put together, but he said it was easy to assemble. I don’t know how many pieces it was in, but possibly 100. Lots and lots of pieces. It all works thankfully. 
I would also like to point out that I don’t consider this a normal size vanity for an adult. I bought this for my 10 yr old who loves skincare and primping, and she adores it. All her friends love it too. Happy with the price and the overall look.