I'm in the conditioning phase and was wondering how far I'm supposed to pull the pump out before I hold it for the 2 seconds?

If I pull too far I'd obviously be pulling the device apart, so at what point do you stop to get maximum plump?

You don't have to pull it all the way out.

I think you should err on the side of caution to begin with. Feel your lips be gently pulled and you should be OK. There's no need to overdo it.

Yes don't overdo it. Don't pull it so far that you start to feel uncomfortable.

Definitely don't pull it all the way out. I think you'll know if you're pulling too far.