Current gear allows for -29 seconds off bloodpacts and a properly geared summoner can crank out 4k+ damage BP's with no hate on the SMN aside from JA use which is negligible. Giving 30-45 seconds would make it spammable for a fraction of the mp of a BLM with no hate?
Last I checked SMN pays MP. Last I checked WAR dishes out 2k x 20 mobs each 10 seconds. Last I checked dead monsters do not have hate on you.

Nah, I'd say current WAR is at least 8 times stronger than Summoner, and you'd have to lower it to 10 seconds recasts, 0 MP cost, to even compete in how overpowered Summoner is compared to a Warrior.