Aloha Chimpiphant,
Thank you Griot.
You can work on them as often as you would like.
If it works out for me to work on them at the beginning and end of the day, I'd do that. If morning and afternoon works out, I'd do that. If I'm around them once during the day or week, I'd do that, and continue to send them love and energy throughout the day as they came to mind. Nothing long or regimented - just a quick minute of seeing them completely healthy, happy, and and feeling loved.
You can energetically invite them to come and do the active exercises or sitting meditations with your during your own practice time as well.
There is no need to hover over them and consciously working on them every 10 minutes or so. Work on them and let them, your master, and the universe handle the rest as the messages settle in the body. Then you can do a session later in the day if you'd like. People fly in to do a week-long, two sessions a day with Chunyi all the time.
Much Love, Shawn