If you have a problem with the add-on ‘Time Spent Creating cards’ (https://ankiweb.net/shared/info/1178407876) post in this thread. I would not get notified if you just posted a review on ankiweb.
Alternatively you can contact me via email: email@example.com
Yesterday I installed the add-on. I’d need a couple of days to see the graphs. I do use several profiles to split my huge collection. I review them all in a daily basis. If at some point in the future I merge profiles, will the time spent data be merged as well?
I didn’t anticipate that people would use several profiles, so the stats for your collection will already represent your all of your profiles.
Hope this is still useful for you.
Here’s how your add-on responds when showing stats for a period with many many months preceding the add-on installation -
I would expect the graph to look much thinner and to actually show the previous months as zero minutes