getting ready for eco

I started a new game. I'm giving the premades makeovers. Adding some sims. I'm playing a little with aging off. The New Skill Day is a couple of days away. I wanted to start Eco Life on New Skill Day so when I get it it won't take long to max a skill. I need a witch with the needs potions so they can just work on a skill the whole day and not have to worry about anything else. I won't have time to do that though. I'm either going to stop playing for now or try to play through a couple of years until New Skill Day comes up again. Do you know how often New Skill Day comes up? Is it every 2 years? Or 3? Maybe I can get a sim to get the Savant reward and get to New Skill Day! I'm totally going to max one of the new skills as soon as I can download the game! Maybe 2 skills!