Why does my total time studied in anki is always wrong ..!

I have found this issue since 1 year usage that I never get the correct statistics of how much hour , minutes I used anki.?
Why so? Is it an error or is some algorithm problem!!!


I have studied for 6 hours but still it shows 25 minutes :sleepy:

It is better to switch to the collection.
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Perhaps this setting affects statistics.
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