Hi! 3 weeks y500 user here!
Well, FOR ME, it actually depends on the type of game i'm playing, and the overheat is not "OVER" at all. The temperature around the keyboard area is actually quite "warm" and "ok-ok" la... but the graphic card section gets hot after playing 2 to 4 hours of gaming (around high settings for new games)...
But the heat dissipates around 30 minutes after i exit the game (shows that y500 cooling system is top-notch!

)
Be aware though, I'm playing this laptop in a quite cramped space, non-air-conditioned room, no cooler-pad, and my laptop is not lifted a bit to allow maximum ventilation for my laptop...
So if u wanna play on this laptop with max performance while increasing the time-limit before laptop gets hot, u have to:
1. Play in a spacious place to allow max ventilation (Spacious room, vents of laptop not blocked, good air circulation in room)
2. Play in air-conditioned room (Well, it's cold, so go figure! )
3. Use cooled-pad if possible (costs some $$, someone told me to get CoolerMaster U3 Pad or something as the size of laptop is compatible with this cooling pad, price around rm75)
4. Lift the laptop a bit (place a book or something to raise laptop, as y500 has another vent-with-fans below it, which blows heat outside from CPU and RAM)
5. Don't play at bed or ur lap or something, it blocks the vents, reduce function of vents, and may cause ur lap to burn! So be careful..
