If you don’t want to enter a Two-Factor Authentication code every time you sign in to your Account, you can mark your computer as trusted. With trusted computers, you don’t need to enter a verification code each time you sign in.
You can add a computer to your trusted list at any time. When you sign in using your Two-Factor Authentication, you’ll be asked if you want to trust the computer you’re using. Click on the box next to "Trust this computer".
NOTE: This feature won't work in private windows or when you clear the cookies and caches on your Trusted Computers.