longHe's been gone a long time.
prolongedShe returned to work after a prolonged illness.
lengthyAirline passengers may face lengthy delays during holiday travel.
sustainedWe continue to see sustained economic growth.
extendedStanding for extended periods of time can be bad for your back.
protractedManagement was locked in protracted negotiations with the unions.
drawn-outIt is likely to be a drawn-out discussion.
lingeringHe had a lingering cough.