Ehhhhhh that's purely a problem of the "setting up" a quantum computer (ok ok and how many qubits are involved). They SHOULD be extremely capable of it. Literally able to get a 'correct' answer in one cycle.

It's just very unfortunate that quantum computers benefit greatly from slower cycles, and the setup of the computations are a real nightmare. As you say, I'm unaware of any that can solve protein folding in a single cycle, and the more cycles there are involved, the more subject it is to the algorithm implemented and setup steps taken.

Maybe one day, we'll have billion-qubit quantum computers solving all sorts of problems reliably, but that day is definitely not today!