Starting offensive linemen are among the highest paid players in the NFL and have the longest careers on average, some spanning more than 15 years.

Dallas is paying its O-Line $41,174,860 this year, $4,574,984 per player on average (including all 9 starters and backups), which is 22.25% of the salary cap.

NFL Offensive Line Spending by Team https://www.spotrac.com/nfl/positional/offensive-line/

And the Giants just made Nate Solder the highest-paid offensive lineman in NFL, "a contract worth $62 million — an average of $15.5 million per year — with a $34.9 million guaranteed."

https://www.bostonglobe.com/sports/patriots/2018/03/14/nate-...