Yep. I agree with lucy. It's individual. And don't worry about being new because after you've had years of experience, should you meet someone new, your training will begin again. Every couple experiences some level of training for the submissive. How else would you know exactly how to treat your master.

Even an old established couple will undergo training as new interests take root, as a reminder of position, or as a reinforcement to rekindle the D/s dynamic.