The best path to take when dealing with a CO or collection account is to first offer to pay in exchange for their agreement to delete if from your credit report. This is called a pay-for delete (PFD).
Paying off a collection account does not in itself get it off of your report. It can say on for 7 1/2 years from the date of the delinquency that led to the charge off or collection activity by the creditor.
If you simply pay it without pursuing a PFD, the creditor wll then have their money, and thus no motivation to delete it from your CR. It will then be with you for 7 1/2 years from the account delinquency date.