Well, we can't know. Maybe it would be trivial, maybe it could keep your data safe for 5ore years. Maybe it could double the cost to crack. No one can know at

Well, we can't know. Maybe it would be trivial, maybe it could keep your data safe for 5ore years. Maybe it could double the cost to crack. No one can know at the moment, hence the trade off, if it costs very little to do a longer key, why not do a longer key?