How much strenght training/cardio for maintinence?

Hey everyone!
Question about working out to maintain (however if I were to gain muscle it wouldn't be disappointing)

Anyways, how many strength sessions and how many minutes of cardio should I do to maintain my weight? Is it counter productive to lift weights then do cardio the next day if I don't have much fat to burn on my body? Someone told me doing that will just burn off.my muscle that I worked on the previous day.

Any suggestions/comments would be helpful, thank you!

Any suggestions on fat/carb/protein ratio would be welcome too. Just trying to get an idea of what other people do!