How to calculate electronic relaxation time

[kcbhamu]

Dear Developers,
Thanks for a great code.
I do not find a tutorial to calculate the tau.
Could you please tell me how can I calculate the electronic relaxation time for any compound on my cluster?
If I understand correctly the given structure, I need to run scf, nscf, and projection on my cluster then using those files, I can do post-processing on my desktop. Am I right?
I will be very much grateful to you if you can provide me step by step tutorial for the same.

Thanks.