To be honest, There is a line right there that says "Total Gym Activity" So my interpretation is, everything under that line it Total for the gym. The time under the pokemon is how long it has been there.
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I was the first person to put a pokemon into this gym, from a grey empty gym after the update.
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Sorry for the misunderstanding, was talking about Total for you. For Example in a week, you have 3 pokemon there over that span. It should say the total time YOU have had pokemon there and total time YOU have fed pokemon there berries.
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I'm interesting too.
But I've different numbers
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Numbers are buggy, will probably become cleaner in about a week.
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I have similar 17384 D - 11 H. I was on this gym quite a bit over the year, but if those are days/hours, I'm thinking it's a little off. ha.
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I think it might have something to do with the last time your Pokémon was interacted with.