Tasks are infinite. Time is not.
Open a task manager and add a task. It takes three seconds. Add another. Three more seconds. By the end of the week your list has two hundred items, and the only thing they have in common is that you typed them in.
The number of things you could do is unbounded. The number of hours you have to do them is, today, sixteen — and tomorrow, sixteen again. Treating those two numbers as the same kind of number is the foundational error of every productivity tool that sells "task management" to busy people.
A list is a count of intentions. Time is the resource that decides which of those intentions become real.
A list is a count of intentions. Time is the resource that decides which of those intentions become real. The right question isn't how many tasks did I complete? — it's how did I spend the hours I had? Make the second question first, and the list becomes a downstream consequence instead of an upstream demand.