Here is a sweet science project that takes time but is worth the effort!
Baking is a great STEM project because it involved chemistry and can be talked about with kids at various ages. Check out this project over at sciencebuddies.org.
This project will take some time so you can use this as a way to talk about any of the themes in self-discipline. You can also talk about being fearless of failure as you try new things out. And at the end, maybe you want to take your “best cookies” over to a neighbor to show some love!