altered-statuses:

“… for each meridian, there is a two-hour period in every twenty four hour day when the high wave of activity makes it more receptive to stimulation. the surge of Ki flow or high wave last two hours; the superior physician finds it advisable to treat the meridian of a weakened organ at the beginning of the two hour period of flow surge”

Jacques de Langre, Second Book of Dō-in: Art of Rejuvenation Through Self Massage (California: Happiness Press, 1974)