My normal lunch procedure was to clock out, order a pizza from a nearby pizza place, drive out to pick it up, bring it back to my cubicle, clock in, and eat it at my desk. This also works well with sandwiches.†
I later learned that I was legally required to take at least 30 minutes of lunch break, and I was horrified. Thankfully there was no enforcement. My mind boggles at the idea that workers need legal "protections" requiring them to spend less time at their home.
Do your work from 9h to 16h, and enjoy a bigger part of your life.
† It was also pretty common for everyone to go out together to a big group lunch. In such cases, the time taken for lunch is whatever it ends up being. But I was free to spend as little time as I wanted on my own individual lunch, if there wasn't a group lunch.