Kyle07: This sounds cool! So no more double gametime tracking? This would be great, I always try to sync between GOG and Steam. ^^'
Technically it still does track them independently because it just pulls the info from your linked accounts, but on their own page (which has a 'friends-leaderboard') it shows the total amount of time played for both accumulated as I said before.
So If you play the Steam version of a game it will increase the game-played for the steam version, not for the GOG version, and the other way round. But it will give you the total hours played based on all platforms on the game-page.
Example: My played time for ''The Saboteur'' on GOG/Origin both show 31 hours 20 min of played time, but if you hover your mouse over the time it shows 2 hours played on Origin and the rest on GOG. (which makes sense, the origin version is broken and I haven't touched that in forever)