Most business advice assumes you have a clean 3-to-4-hour block of deep work, but real days usually look like 20 minutes here and 15 minutes there between errands, kids, or day jobs. Trying to tackle a massive project in those tiny windows usually just leads to spending the first 10 minutes figuring out where you left off.
Do you keep a running list of "micro-tasks" you can knock out in 15 minutes, or do you only sit down to work when you have an uninterrupted block?