I am not too sure how to calculate this, if someone can help me.

We have at the Uni one NVIDIA DGX A100

It packs 5 petaFLOPS, eight A100 GPUs with 320GB of GPU memory.

Realistically, if we get permission to run it 24/7 (which I doubt lol) for the 120 key, how long would it take? Is it feasible? And more important, would the Kangaroo even work on it?