Ideally, you would focus on doing just one thing; do it; then move into doing something else. But in the end, you find so many distractions. Tasks take longer to do than expected. Things get post-poned for tomorrow, for next week, or for never.
Again and again, what happens is not that we don’t have time to do stuff, is that we want to do more stuff than we can. What else would you be able to do if you renounce to non-important things?