On a start of a possession with out any penalties it is 10 yards long.
10 yards
10 Yards is the First Down.
6 yards for first down on first play after that it is 20 yards for each 1st down
10 yards
10
10
10
Ten yards equals thirty feet.
10 yards for a first down
how many yards are left until first down.touch down.
Ten, unless there was a penalty.
In football, you have 4 down or attemps to get so many yards, a third down conversion is where you failed to get the amount of yards on first down and second down then reach it on the third, making it first down again