We've been collecting our stuff for about 2 years. He's been able to figure out how to use the on/off button around the time he turned one, so we've been going through batteries since 🙂 He's fine pushing stuff around but he prefers the engines to just go on the battery power.
Living in a 2 bedroom apartment doesn't really allow us to setup a permanent layout so every Saturday it's something new being setup just to keep us busy and entertained.