When I play games, it would be useful to know how long I've been playing (without having to remember when I started).
Several solutions exist that provide session timers, but they are obtrusive, displaying a HUD or other and/or are not permanently visible. The solutions that are permanently visible show just a simple clock and not a session timer.
Things I've tried, and mostly rejected:
Steam and EvolveHQ include overlays on top of games which also display a timer or counter showing the time spent playing the current game. While displayed, these overlays darken the image and fill the screen with buttons and hud elements.
Xfire has a nice and simple clock overlay for games, but it only displays a real time clock, and not a session timer.
Is there a way to modify any of these solutions, or are there any other solutions that will provide a permanently visible session timer?