We don't have a structured "school time," but we do have various projects that we work on, whether it's making something, cooking, or reading together.
Now that ds2 is mobile, it is SO hard to find time to find time to focus on ds1's needs. (Ironic, because it was totally the opposite when ds2 was a newborn.)
1. I accept that I can't predict when circumstances will allow me time alone with ds1.
2. I always have a "next" project ready to go when opportunity knocks.
3. I look for things to do out of the house. While I hate for ds2 to spend too much time in the stroller, the fact is that they both really enjoy new places. (For example, today I found myself in the car with time to kill, so we stopped at a different park and walked around the soccer field. I was amazed at how much there was to see.)
4. If days go by between "official" projects, that's OK. He's still learning.
My motto for most things is -- 'the best I can do is going to have to be good enough.'