What I want to do is put my computer on stand-by after an hour approximately.

I can't use energy profiles because the computer will still be running a game which eliminates the idle condition.
I can't use scheduled tasks because I don't know a command that will put the computer to stand-by when hibernation is activated *.
I could use a program that does it for me, but I'd rather do it with the tools that Windows 7 offers to me.

* I've almost found the solution by scheduling a .bat with the following line:
rundll32.exe powrprof.dll, SetSuspendState
However when I have Hibernation active it will suspend to disk (hibernate) instead suspend to RAM (stand-by).
I've found claims that adding " Standby" to that line would work, but it doesn't for me. (Windows bug?)

It works if you turn off hibernation.

Just make an autoit script which presses the "sleep" virtual key.