I've read several SSILD, MILD and WILD guides and they all mention WBTB, but they all use it differently. This would be easy to understand if the difference in time awake while WBTB-ing was limited to the differen techniques, but it isnt.

Some people/guides say that if i want to WILD i should stay awake for 1-3 hours in the middle of the night, some say 10 minutes, other say that i should stay awake as little as possible (aslong as i can remain aware of what im doing).

Could someone explain this to me? How long you should stay awake during different circumstances while WBTB-ing?