Ever know someone who works slower than you (and drives you crazy?) or faster than you (and drives you crazy?). Do you look at these people and wonder if you're overworking or underworking?
Let me put your mind at ease – we all have our ideal work pace. We just have to find it.
I myself like to keep up constant activity, punctuated by breaks, with a decently full plate. I know other people who ONLY work in huge, long, multi-day bursts of insane effort. I know others who like slow and steady. Everyone's different.
If you want to be a success, in your hobbies or your career, you need to find your ideal pace.