long(TIME)
protracted
Thesaurus: synonyms, antonyms, and examples
continuing for a large amount of time
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.
SMART Vocabulary: related words and phrases
Lasting for a long time
all-night
ancient
be going strongidiom
changeless
dateless
incorruptibility
incorruptible
incorruptibly
languish
lasting
nondurable
nondurable goods
of oldidiom
old
ongoing
timelessness
unslaked
until doomsday
venerably
year