A good question to ask is if it would still take 2 min if hooked up to a ship's nuclear reactor power grid, or if the 2 min is more of an artifact of it being an alpha test rig designed more for data and refining the design.

I'm positive that at the very least they've got plans for making the version fire faster than one shot ever 2 min in a production model, even if that means throwing 16 times the hardware / capacity at the charging and cooling components.