After each request, gap can be for 30 min, as 30 min is the maximum time VK send energy by auto healing.
When you place VK for 30 min on paper, after completion of 30 min, VK is free for next request.
It is important to keep wearing VK for maximum time. So you can prioritise your healing accordingly. Or request for another VK to manage your healing.
It is ok if human mind thinks on multiple issues. For your important wishes, put clear positive intention to VK