I have a lot of confusion with "in". Take this sentence:
"I will kill you in 5 seconds."
I see 2 senses:
1st sense: I will kill you in 5 seconds = I am taking my coffee, and 5 seconds later I will kill you.
2nd sense: I will kill you in 5 seconds = I need 5 seconds to kill you, I start at 0..1... I'm killing you... 2...3...4... Almost killed you...5 I killed you.
How to know which sense it is? To avoid the misunderstanding, how should we write it? Maybe I have to use another word than "in" ?