First off, just to reassure everybody, I have no motive other than pure curiosity for asking this question.
I don't want my bank account hacked any more than you want the same done to yours.
My question, if it makes sense to those in the quantum computing area, is how many qubits would it take for a quantum computer to crack, if it's possible in the first place, an RSA 2048 or 4096 bit encryption code, in a reasonable time, say under a year or two?
In other words, around how long before I need to really worry about this as a real prospect?