If you’re running more than one operating system in a Dual Boot config, when you boot your system, your Windows Boot Manager will display a selection menu asking which OS you want to boot into. By default the boot manager will wait 30 seconds before loading the default Operating System (OS). For some, this is too long and for others not long enough (depending what your doing of course). The fix? A simple command prompt command.
How To Change The Time Windows Startup Takes To Automatically Choose And Boot the Default Operating System
1. Click the Start Menu Orb and then Type CMD into the search box. Next Right-Click the cmd.exe program link and Select Run as administrator.
2. In the command prompt Type bcedit /timeout 180 and then Press Enter.
Note: 180 represents the number of seconds that the Windows Boot Manager will wait before automatically booting into the default Operating System. You can set this number to however long you would like it to wait.
Voila! Now when you boot up windows it will wait at the boot selection screen the amount of seconds you entered before automatically starting. If you want to double-check the setting saved correctly then simply Type bcdedit into the command prompt and look under timeout.