BCDEdit /timeout
The BCDEdit /timeout command sets the time to wait, in seconds, before the boot manager selects a default entry. For information about setting the default entry, run "bcdedit /? default".
bcdedit /timeout <timeout>
Note
Before setting BCDEdit options you might need to disable or suspend BitLocker and Secure Boot on the computer.
Parameters
<timeout> seconds
Specifies the time to wait, in seconds, before the boot manager selects a default entry.
Examples
The following command sets the boot manager <timeout> to 30 seconds:
bcdedit /timeout 30