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I can't believe Paizo thought that extending the duration by a factor of 10 wasn't broken!
It's not particularly broken. As others have said, most combats are over long before that duration comes up. And if PCs are looting and searching areas, the monsters will finish up their durations faster than you think. If they want to use them for multiple combats, they need to keep the pressure on and that probably undermines healing between combat as well as other buffs.
The main overpowered aspect of the master summoner for a PC really is being able to use the summon monster SLA concurrently. The main summoner can't and can't even do so with his eidolon around. I'm playing a summoner in Skull and Shackles and there are quite a few times I wish I had been able to do multiple SLA summons at the same time but have had to settle for sequential.
The master summoner has a role in PF but that role isn't right for every game. He's great for war-oriented campaigns since he can spam a lot of troops that the GM can deal with narratively rather than roll dice for and he's great as an enemy for PCs. But his summoning powers and how they work don't work with traditional 4-man dungeon-crawlng very well.