Light trusts himself, trusts his abilities and what he can observe; he believes what he sees because he believes he's not so easily deceived. Pretending otherwise is pointless fancy, and Light has no time for that.

"No, I haven't - you're right." Not yet anyway. Light isn't blind to the reality of his current circumstances, but that doesn't mean he'll blindly accept it, either. There must be something that can be done to prevent his own eventual transformation, and he won't rest until he's exhausted every possible angle.

"How long does it usually take, in your experience?"