[JorgeGT]

It really depends on the problem to be solved (domain size, complexity of physical phenomena such as turbulence model, heat transfer, acoustics, multiphase flows, combustion, etc., number of time steps required...). In our case we perform for instance simulations of turbomachinery acoustics that can take 3-4 weeks running in a few hundreds of CPU cores, combustion acoustics simulations that can take a week or two running in 1k-2k cores...

[knewter]

what if you had 100k H100s

[JorgeGT]

In reality few codes are capable of effectively parallelizing to so many computing processes. But, how cool would it be?