Synonyms and antonyms of Long periods of time in American Thesaurus

eternity (noun)

an extremely long time

light years (noun)

informal a very long way in time, distance, or quality

ages (noun)

informal a long time

hours (noun)

a long time

year (noun)

a very long time

long (noun)

a long period of time

epic (noun)

an event or activity that lasts a long time and is sometimes difficult or complicated

aeon ()

a British spelling of eon

eon (noun)

an extremely long period of time

months (noun)

a long time

a month of Sundays ()

a very long time

hour after/upon hour ()

a very long time