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First of all, 2DES is $$\textrm{ciphertext} = E_{K_1}(D_{K_2}(E_{K_1}(\textrm{plaintext})))$$ The below from 19 September 2020 on the Bitcoin mining, Bitcoin mining is based on SHA256d calculations. All in all, ASICs, FPGAs, GPUs, and CPUs. \begin{array} {|l|c|c|c|c|}\hline & \text{in a second} & \text{in a hour} & \text{in a day} & \text{...
The upper limit really depends on your risk. The birthday attack's 50% probability is a too big risk to rely on. Let's look at some numbers assuming that the total of the points is $2^{256}$ which is not bu very close*. Assuming the keys are constructed uniform randomly like a coin toss. We will use the fact that the probability of collision among uniform ...