Yes, I think it is the time spent on a topic page, but I was wondering about the unit whether it’s seconds or minutes. I tested by checking my username and I had not spent any time reading any topic post so I clicked on a topic and waited a little bit then came back and it was 217 so it’s seconds. It’s 100% not time spent on the site because I’ve been working on the Data Explorer for more than an hour! 
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