When you work on a task that you enjoy doing or are more skilled on, it is easy to enter a flow state (full concentration) and focus on the work; while you remain oblivious to happenings around you, thus facing less or no distraction.
The opposite is the case when you work on a task that you are less skilled on or something you really do not enjoy doing. You are more likely to be aware of all the distractions and even suffer anxiety, thus being unable to get much done.
In the first instance, you would get more done within a given time (say 1 hour) compared to how much you would be able to do in the 2nd instance given the same 1 hour.
In instances like these, as a creative, you should delegate jobs you don’t enjoy doing and as an employer, it is important to match your employees with the type of work they know how to do well in order to improve performance and output.
However, there are times you might need to challenge yourself to learn new things and also increase your work rate. But bear in mind that even when you do this, make it a gradual process so that you don’t push yourself too hard.
From the foregoing, you can see that how much you get done within one hour varies from one task to another depending on your level of skill at such task.
This knowledge should be useful when planning your next to-do list.