Dear Ajit,

please fill you signature with your affiliation, this is a rule of the forum. You can do that once for all in the settings of your user profile.

I was wondering how long it would take for a metal like copper to get the lifetimes starting from the scf calculations in DFT with and without running yambo in parallel

Unfortunately we do not have benchmarks for this kind of calculations, so I cannot tell you.

Anyway, depending on the convergence parameters, it will depend a lot from the pseudo you use etc. The GW part of the code is totally parallelized with different strategies so running in parallel will be very advantageous both in terms of time and memory distribution.

Is using Quantum espresso Pw + yambo faster than Abinit + yambo ?

Once the ground state is calculates, next the yambo calculation is independent of the code used to generate it. Which is faster between Abinit and QE I do not know, I imagine to find similar performance for a standard ground state calculation, I suggest you to use the one you are more familiar.

I also would like to add {DFT+U with spin polarization} as well after my DFT calculation.

Yambo can support spin polarized calculations, anyway if you plan to do a GW calculation starting from DFT+U, there will be some term misising in the commutator coming form non local potential needed for the evaluation of dipoles, if these are important or not, it is something that need to be verified.

Best,

Daniele