The bottom of a vent connector elbow is 60″ above the floor and is tied into a common flue at 61 1/2″ above the floor. How long is the vent connector from the outlet of the elbow to the common flue connection whe n the length is based on a minimum pitch as required by code?

The bottom of a vent connector elbow is 60″ above the floor and is tied into a common flue at 61 1/2″ above the floor. How long is the vent connector from the outlet of the elbow to the common flue connection whe n the length is based on a minimum pitch as required by code?