You're asking me? I have it on good authority that I'm an idiot.
[He pauses, and then:] The biggest limitation I have is that if I don't know where I'm going, I could teleport into something solid. If Kitty were to come with me, that negates one issue. Another is distance, but that's largely tied to a planet's magnetic field. Doesn't seem to apply so much when I'm going through a dimensional tear. It's rough, but I was able to do it multiple times in a half hour and I was still on my feet with enough energy to argue with Wolverine.
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[He pauses, and then:] The biggest limitation I have is that if I don't know where I'm going, I could teleport into something solid. If Kitty were to come with me, that negates one issue. Another is distance, but that's largely tied to a planet's magnetic field. Doesn't seem to apply so much when I'm going through a dimensional tear. It's rough, but I was able to do it multiple times in a half hour and I was still on my feet with enough energy to argue with Wolverine.