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.
protractedManagement was locked in protracted negotiations with the unions.
drawn-outIt is likely to be a drawn-out discussion.
long-drawn-outApplying for a work visa is a long-drawn-out process.
lingeringHe had a lingering cough.