I'm really bad at time tracking. In terms of health of the worker, I don't think it's helpful to have a time limit looming over people's head. I know I still remember the feeling of "Oh, almost the end of the day!" and my brain would immediately stop taking work seriously.
As for a personal productivity technique, I think it can be helpful! Also a big fan of Pomodoro, although I haven't used it in a while. For me, what it boils down to is just being honest with myself and deciding that "okay I should be doing work instead of distracting-thing", or that setting reasonable time expectations for tasks.
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