Think of it like playing a musical instrument, the more you practice the better you get.

You can do any training in the world, but it will not beat actually going to a gym, and having one-on-one coaching.

Twice a week would be fine, throw in some running, skipping and shadow boxing and footwork,footwork,footwork

Once a week you will still make plenty of progress.

If you went zero times a week how much better will you get, how much stronger, fitter, healthier.