I don't know if this would work to be "always on" since it might need a target (?) -- can we just have equal recast/duration, like a handful of other abilities? It could still be longer, like 5min (or more) ... and you could choose to keep it active fulltime, if you wanted.

But this would also allow you to kinda turn it on/off at will. I remember Cecil! He did it until you told him to stop! :D