Answer based on context:

Still looking for a win the Bills flew to M&T Bank Stadium for an AFC duel against the Ravens. In the 1st quarter the Bills trailed early as kicker Billy Cundiff made a 41-yard field goal. But they pulled ahead with QB Ryan Fitzpatrick completing a 33-yard TD pass to WR Lee Evans, followed by kicker Rian Lindell hitting a 21-yard field goal. The lead was increased in the second quarter with Fitzpatrick finding WR Steve Johnson on a 33-yard TD pass. The Ravens replied with QB Joe Flacco making a 26-yard TD pass to TE Todd Heap. Then Fitzpatrick found Evans again on a 20-yard TD pass to put the Bills up 24-10. The lead was narrowed when Cundiff hit a 48-yard field goal, followed by Flacco throwing a 14-yard TD pass to Heap. In the third quarter the Bills fell behind with Flacco completing a 34-yard TD pass to WR Anquan Boldin, followed by RB Willis McGahee getting a 2-yard TD run. The Bills managed to tie the game in the 4th quarter with Fitzpatrick making a 17-yard TD pass to Evans, and with Lindell getting a 50-yard field goal. After overtime, the decision was made when Cundiff successfully put away a 38-yard field goal to keep the Bills winless after 6 games. With the loss, the Bills fell to 0-6. After a win by the Carolina Panthers the same week, the Bills became the only team still in contention for an imperfect season.

How long was Billy Cundiff's longest field goal?
48-yard