note: should work in earlier versions of windows too
1. open regedit*
2. navigate to HKEY_CURRENT_USER\Control Panel\Desktop (screenshot below)
3. change the value of ForegroundLockTimeout to 30d40  (by default the value is probably 0)
Restart may be required for the change to take effect.
*pssst.. 30d40 is the hex value for  200000
* to open regedit hit the windows key and search for "regedit"

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