While in lockdown, I have been - watching my avocado plant grow. Takes ages. I recommend it as a long term project. In fact, it's so time consuming, I have started another one off on the kitchen windowsill. Three
months later, and there is a root growing! You see? Always something going on when you are growing your own avocado plant. Apparently, it's only about thirty years until they actually fruit. Decades of fun to be had!