How long will a charged off credit card stay on my credit?

I have 2 credit cards, one is maxed out at $600 and the other one is maxed out at $500. I only make minimum wage and putting gas in my truck and paying rent eats up my whole paycheck. I stopped paying these cards over a year ago. The Chase card is in collections with LTD Financial, and the Capital One card is being handled by NCO Financial. I talked to Capital One and they said that paying it off now won't help my credit, so I told them, *uck it then, I won't pay it if my credit will still be *hit.