The key to this is that you start with the top important tasks first and work your way down.  Your goal is to at least get the most important tasks done first.  Then, if you have time, you can keep working your way down the list.

Your affiliate marketing advertising business should have marketing in the top positions of your list.  If you get to the end of your day, and all of your least important tasks are finished, but the most important ones haven’t even been started, you have not accomplished what needs to be done.