I use an app, Pomy for Mac, that tells me to look away for 20 seconds every 20 minutes. I try to get up and stretch during those 20 seconds to get the blood flowing.
Anyway, it also counts how many 20-minute blocks I did. At the end of the day, I just write that number down on my journal and reset the counter.
It’s as accurate as I can do, because I usually close my laptop when I step away for longer than a minute or two. It’s not meant to bill clients or anything like that, just for me to track how long I spent working or studying.
The nice thing about it being 20 minutes is that I can divide the daily number by three and get how many hours I worked precisely.
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