There is a point where you re-key faster than your key leaks through that specific timing attack. Or re-randomize memory layout, etc. Or where the payoff (due

There is a point where you re-key faster than your key leaks through that specific timing attack. Or re-randomize memory layout, etc. Or where the payoff (due to limits/quotas) implies a cap on the effort that's still worth it. It's like Backups: you do as much as you want to pay for, considering the amount of risk you'll be left with.