This was a surprise birthday gift for my daughter while she had seen the playhouse part we didn't hang the swings and slide until her actual birthday party. The assembly was quite easy. There was a couple hiccups with interactions but was easily able to figure out. It probably took myself and my husband 1 full day if we were to add up the actual hours to put together. 
I have to admit I was a little nervous after reading the reviews with mostly seeking 2-3 full days of assembly but if didn't turn out that way for us. :) 
My daughter LOVES this set and was super excited to see the slide and swings.  We are very very happy with our purchase.