Currently, there is no way to track how much time you have spent playing Roblox games or even in Studio. Sure there’s Time Tracker by @BuildIntoGames but still, that doesn’t even do the job. It can’t track all-time.
Why Add this Feature?
As a developer, I want to know how long I spend on making my games. I also want to see how much time I spend on playing versus developing. It would also be heavily useful for people making work for others that are paid via hourly pay or some other form of time.
More About this Feature Request
What it would do is track how much time you spend on the website, in each individual game, and on each individual studio game. So for instance, if I play 26 hours of “Adopt Me!” for some reason it would show 26hrs for time spent in “Adopt Me!”.
Where it Could Be
It could possibly be placed in a new sidebar tab or maybe on your profile.
Thank you for reading! Please leave a reply with any ideas you have that would go with it or any criticism. Thanks! 
