Time on our hands

anachronism

anything that is out of place in time

anon

soon; shortly

antebellum

before the war; especially before the American Civil War

antediluvian

old fashioned; before the flood

atavism

reversion to a primitive type; resemblance to a remote ancestor

augury

the art of prophecy; an omen

betimes

early; promptly; before it is too late

biennial

happening every two years

diurnal

daily; of the daytime

eon

long, indefinite period of time; thousands of years

ephemeral

short-lived; transitory

epoch

noteworthy period

generation

the period of time between the birth of one group and that of its offspring

score

twenty people or objects; twenty years

tercentenary

a period of 300 years