As a torch throws its light on the object you focus, VK sends its energy through your intention wherever you focus.
As you focus on some object, the light through the torch will light that object.
As you move the light to next object, the light will move too. You don’t need any gap. Same way VK will send energy wherever you focus with your intention.
So keep requesting as per your need. VK will work and keep working as per your wish, request and intention.
To work for 30 minutes for one request is the mechanism of VK. VK is constricted so. You can let it work for 30 minutes or request for a new wish, that depends upon your need and not on VK.