LogFAQs > #881750154

In battle, visions are generally given about 15 seconds before any of Shulk's allies or himself are either KO'd or put to like 20% or lower HP by an enemy attack, though it also can give it in advance much longer depending on the severity of the attack. One of the examples is when fighting Egil, he has a move where he attempts to use the Mechonis sword to attack the Bionis, killing hundreds or thousands of people living on Bionis. Shulk has an in-battle vision of this at least a minute in advance to prevent it, despite being in the head of the Mechonis and not threatened by the attack.

By cutscenes, the visions are either nonstop or incredibly thorough, given he abuses them nonstop to do almost every single battle he has.

https://www.youtube.com/watch?v=rgERZsyAMWI#t=3m10s
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You can't live without a spinal cord, son. Nothing unnatural about that.