Another unit of measurement

I was talking with @rub1e yesterday about recording everyday tasks with a time tracker. e.g. reading a book.

I said I was doing it as a way of seeing how much time I spend in a given amount of time, a week for example, doing that. He suggested that that data one it's own may not be very helpful when looking back on it.

For example, if I spend an hour cooking one night but only made cheese on toast I might not be very happy with that. If I made a roast dinner (and somehow no one was poisoned from raw meat) in that same amount of time it could be a good achievement.

This makes me think that it might be worth adding another metric. I'm not sure on how to track this other metric (I'm not even certain what it could/should be), I just thought it was worth capturing the conversation.