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So in the book it says it is enabled until the end of the next turn, which my opponent explained as 2 full turns then.

Meaning when I cast say Prescience, it lasts from start of beginning of turn 1 to end of turn 2.

But what I interpreted was that until the end of next turn meant that the start of beginning of turn 1 to the beginning of turn 2, which would be end of a turn.

If the former is true then psychic powers just got really insane.

Anyway, thanks for those who can clarify this.

Point your friend at p9 of the BRB...

Turn, unless otherwise specified means Player turn, not game turn.

Each power tells you how long it lasts for.

Next turn refers to the turn after this one. So the next turn is the turn after this one.

Fragile and Snapshot are correct. Unless it says game turn it is referring to player turn. A power that lasts 'until the end of the next turn' will last until the end of the next player's turn. In a 2 player game (the nomral way to play 40k) this effectively means until the start of your next turn.

Make sense?

On a related note, I wish they had just called game turns rounds. Would be less confusing.