It’s completely up to you! Some people only try it once, some people come regularly.
However, depending on your health concerns and the magnitude of the associated imbalances, I would suggest a minimum of three treatments over three weeks.
In time, following your healing, you will start to feel happier, less anxious & stressed, and full of positive energy!
For reference most clients will continue their sessions as recommended, coming back once their course is complete for ongoing Reiki maintenance.