Your computer probably boots with grub, and in a grub configuration file, there is a “timeout” value that you can reduce. It is not recommended that you let it be less than 2, but if it is three or more, go ahead and change it.*
I’ll make it real simple for you, if you are running Gnome. Copy and paste the following into a terminal window:
sudo gedit /boot/grub/menu.lst
You will (probably) be prompted for the password, enter it, and “gedit” will open up an editable version of the file.
Search for “timeout” and change the number as you wish. Save the file.
Perhaps you are only reducing a ‘3’ to a ‘2’ but that one second every day or so will add up. Just make sure you read this post really fast and carry out the instructions real fast or it won’t be as worth it!
* Nothing is guaranteed to work. If you take my advice and mess with your computer, FSM help you.