It took me about an hour tops to put the tower together (solo) including time it took to take a few sections apart because I put them on the incorrect way but easy fix since I was able to catch my mistake immediately. The directions provided are very easy to follow it was just my oversight. Had I not ran into these issues, I probably would of had the tower up in 45 minutes versus an hour.  The grey color is absolutely beautiful and it stands a bit taller than it looked in the advertisement. My cat Blaze loves his new Condo. I only own one cat but there’s plenty of space for multiple adult cats. So happy I trusted my gut and went with this one. You can mount the tower to the wall to prevent it from possibly tipping over. I opted not to the wall, it’s got some weight on it and is pretty stable/steady without the wall mounting.  It’s only been a week as of today, however, so far so good. I do recommend!