In rogue trader rulebook said that:
" Using this power (Foreshadowing ) more than once in the same hour is dangerous, as no one should know too much about his own future.For every use after the first in a single hour, the Navigator suffers 1d5 Insanity Points. "
Does this rule working if navigator failed perception test? I assume that in case of failure navigator didn't see the future, so he could try it again without gaining insanity points. What do you think about this?
And by " same hour " does it mean in game hour or the real life hour?