Depends. Not the systems themselves but more the scope of the work and how it is being done. If the field is boring or the design itself is bad(with no ability

Depends. Not the systems themselves but more the scope of the work and how it is being done. If the field is boring or the design itself is bad(with no ability to make it better, whether it's simply by design, code quality or whatever), my motivation, will and desire to work teleports to a different dimension-it's a fine line between exhaustion and frustration I guess. If it is something interesting, I can work on it for days straight without sleeping. Lately I've been working on a personal project and every time I have to do anything else I feel depressed for having to set it aside.