I'll show you how to look slimmer in 30 days!
No, but on the serious side, I'll show you how to below.
1. On the forums, towards the bottom left of your screen you'll see Something that looks like this.
2. Scroll down to where it say's View All Players & Stats.
3. In the search bar, you can search your steam name.
4. Once you search your steam name, click on it in the menu below.
5. Once clicked on, you can view your Activity, Through the Day, Month, and Week.
Also, Total Minutes , Score, First Seen, and Last Seen.
Hope this helped, have a nice day!