Of you have been using VK since long then now learn to know when the energy gets filled up in the huge or small quantity.
Whenever the energy is filled in the contents there is a repulsion by the energy. Of you want to learn this then please do try to know when this repulsion happens.
Time of 30 minutes rotations is just an approximate number and nothing fix, As it also depends upon the healer. A new healer might take time to send energy but a highly spiritual person or an old healer might be able to do it more fast.
Hope you will try to learn the repulsion with VK and share your experience here.