Coming off their divisional home win over the Falcons, the Saints flew to Monster Park for a Week 8 intraconference duel with the San Francisco 49ers.  In the first quarter, New Orleans drew first blood with QB Drew Brees completing a 17-yard TD pass to WR Marques Colston, along with kicker Olindo Mare getting a 26-yard field goal.  In the second quarter, the Saints continued their offensive revival with Brees completing a 2-yard TD pass to WR Terrance Copper, along with a 3-yard TD pass to Colston. In the third quarter, the 49ers tried to come back as kicker Joe Nedney nailed a 29-yard field goal.  In the fourth quarter, New Orleans managed to put the game out of reach with Brees and Colston hooking up with each other one last time on a 15-yard TD pass.  Afterwards, San Francisco's only response would by QB Alex Smith completing a 7-yard TD pass to TE Vernon Davis.
Question: How many yards longer was the longest touchdown in the first two quarters compared to the shortest in the first two quarters?
Answer: 15