Windows 10 Windows 10 email duration ?

I am not computer savy I want to set the duration to a custom value via the MessageDuration Registry value; to be longer then 5mins can I do it using the settings below if so how do I set it up ?

• Windows 10
  Start-> Settings-> Ease of Access-> Display (or “Other options” in earlier Windows 10 releases) -> Show notifications for x seconds/minutes

You can set the duration to a custom value via the MessageDuration Registry value;

Key: HKEY_CURRENT_USER\Control Panel\Accessibility
Value name: MessageDuration
Value type: REG_DWORD

As the value you must enter the duration in seconds. Set the base from Hexadecimal to Decimal to more easily set the value.

Any setting longer than 300 will end up displaying the alert for 5 minutes. Any non-predefined duration will display the option in Settings being configured to display the alert for 5 minutes even though it will actually display it for the duration configured in the Registry. This means, you can also set the alert to display for 45 seconds or 2 minutes.