How long is a f-150 4 door full box?

The length of a Ford F-150 with a four-door configuration and a full-size bed typically measures around 20 to 21 feet (240 to 252 inches) from bumper to bumper, depending on the specific model year and trim. The bed length for a full box is usually about 6.5 feet. It's important to check the specifications for the exact model year you're interested in, as dimensions may vary slightly.