Using sudo without typing sudo more than once per sudo session?

Question

How can one use sudo, without typing sudo more than once per sudo session?

By that I mean that you'll be asked to type your password each 15 minutes after the last command you executed, while executing commands within this time (within this "grace period") will restart the timeout.

Another example:

1. You boot the system.
2. You execute any command whatsoever.
3. Immediately after that, you are being asked to fill in your password.
4. The command is executed.
5. If 15 minutes passed and you haven't typed any command (say, you suddenly had to leave the PC), you will be prompted for your password again.

This could save typing the word sudo instead typing it tens if not hundreds of times a day (not always you run scripts as sudo).

Answer 1

Use sudo -i. The -i option will log you in and you won't have to retype the password or add sudo before commands every single time.