I made out like a bandit with my song. I paid $75 for what was supposed to be a "half song"- around a minute and a half- but the song I received was over 4 minutes. It was a very personal, heartfelt song. I would highly recommend this to anyone on the fence about it.
I think it's really whatever Max feels like at the moment when it comes to those song lengths. I'm sure he aims for a certain minimum. Even full lengths are often closer to two minutes.
If he earns as much in Say Anything royalties as he does in song shop then I would be surprised. Maybe in album release years he comes close.
And he's definitely a better artist than Mark Hoppus.