Coming off their season-sweeping road win over the Eagles, the Giants went home for a Week 15 Sunday night NFC East rematch with the Washington Redskins. In the first quarter, New York trailed early as Redskins kicker Shaun Suisham managed to get a 49-yard field goal for the only score of the period. In the second quarter, the Giants continued to trail as Suisham kicked a 31-yard field goal, along with RB Ladell Betts getting a 14-yard TD run. New York would get on the board with kicker Lawrence Tynes getting a 35-yard field goal.  Washington would end the half with Suisham nailing a 28-yard field goal. In the third quarter, the Giants' deficit climbed as Redskins RB Clinton Portis getting a 5-yard TD run (with a failed 2-point conversion). New York tried to make a comeback as QB Eli Manning completed a 19-yard TD pass to TE Kevin Boss. However, the wind and Washington's defense prevented any hopes. Eli Manning set a record of futility in the game with 35 incomplete passes, setting a record for most incomplete passes in an NFL game since the AFL/NFL merger.  In fairness to Manning, his receivers also did not play well, dropping at least eight of his passes.  Washington quarterback Todd Collins, making his first NFL start since 1997 in place of the injured Jason Campbell, didn't play much better, going 8-25, but got the win. With the loss, not only did the Giants fall to 9-5, but they also lost TE Jeremy Shockey for the year in the third quarter with a broken left fibula.  It would be his final appearance as a New York Giant.  Due to the Giants's increasing problems with Shockey's attitude and the emergence of Kevin Boss during the remainder of the season, he became expendable and was eventually traded to the New Orleans Saints.
Question: How many yards shorter was Suishams shortest field goal of the first half than his longest?
Answer: 18