As a workaround, you could add them manually: not via the Battle.net integration, but as "Mark as Onwed" and link the executable. In that case, GOG will keep track of the playtime.

Thank you for your suggestion, unfortunately that won't track play time either. I tried both with the Modern Warfare Launcher.exe and Modern Warfare.exe

Oh, I am sorry. My understanding was that GOG was able to track playtime via manually-added games. Thanks for letting me know.

hello everyone, it would be really nice if gog would call up the playing time from cod and integrate it into the statistics of the total playing time. xbox accounts and psn accounts are supported