I managed a side project over the pregnancy, birth and to age 4 of my twin girls and full time job. I dropped down to 15 mins a day, but a tiny amount of forward progress aggregated over years can achieve a lot. And actually, I got so good at context switching by having clear todos, that those 15 minutes I got were worth a good 15 mins. You get to spend the rest of the day mulling about how to use those 15 mins that the quality was surprisingly high and going down the wrong path was rare. I had to save refactors for Christmas though.
This is a good practice. I find that diligently doing like 15 min a day tasks sets you up to subconsciously put your mind to solve problems when you’re busy with less analitical cognitive tasks around the house/family or idle moments. The project’s always on the back of your mind this way and when you spend 15 minutes you’re in the save to disk mode.