You can do it all the way down to Pomodoro-like work chunks counted in minutes, up to long term strategic goals and have things like quarterly OKRs and Scrum-like sprints in the middle.
The best entrepreneurs naturally think and act like this, from Elon Musk to the late IKEA-founder Ingvar Kamprad, who is quoted saying:
“You can do so much in 10 minutes time. Ten minutes, once gone, are gone for good. Divide your life into 10-minute units and sacrifice as few of them as possible in meaningless activity.”