As shown in many of the messages on #progress
#How do I check the total time spent reviewing on anki?
gray oxide
stable compass
As shown in many of the messages on <#370271493688393729>
One of the ways is to see the stats for the collection and check "Time" on the Reviews panel, and it'll show the time for the past month/3 months/year but that's not quite the total time
delicate talon
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https://docs.ankiweb.net/stats.html#statistics (built in) (select All History and Collection at the top to view your all time stats.)
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https://ankiweb.net/shared/info/1247171202 (add on to add total study time information to main page)