That I can stand being miserable for quite some time, if that's what it takes.

[Whatever doubts he might have about this, is covered with bravado and an arched eyebrow. Misery has never tasted like this, stale air and endless hours dragging on until he loses his sense of time and the crystal-clear path to success.]

Some of those might be doable, aside from the training I'm already undertaking. It wouldn't be wise to let ourselves go while we wait for the next mission, with all the fighting we've encountered.

[Hobbies, what are those?]

What sort of research?