You might be knowing that, screensavers are the moving pattern which helps in protecting the computer monitor screen from burn-in due to the static text or image residing on it’s screen for longtime.
On the Microsoft Windows Vista and Windows 7, one can configure the timings for the screensaver to come in, which is set to 5 minutes by default.
So, to change that default timeout, perform a right click anywhere on your desktop and hit the Personalize option. Then click onto the Screen Saver, and change that default value present in the wait text field and hit OK at last.
Here you go, you just set the screensaver timeout value.