time out of mind
ages
donkey's
grip
blue moon
age
crow's age
years
coon's age
hot minute
eon
light year
lifetime
long-span
eternity
prolongedly
aeon
imperishable
forever
abiding
enduring
lengthily
long-pending
inveterately
at length
forever and a day
long time
dog's age
stretch
period
month of Sundays
until the cows freeze over
until the cows come home
long
long ass
with ages
undestroyable
perdurable
donkey's ears
durable
indestructible
donkey's years
yoinks
long as one's arm
lengthsome
ultralong
far
longwhiles
hyperextended
overlong
superlong
prolonged
no end
durative
anciently
longsomely
minute
drawn-out
any more
Rome wasn't built in a day
macro-
yonks
dolicho-
fleeting
overprotracted
momentaneous
momentary
fugitive
macrobiotic
tract
long-range
in the long term
in the long run
protracted
extended
longue durée
indefinitely
for long
lengthy
longways
sesquipedalian
eudemic
old
long-lasting
for the long haul
long haul
mecocephalic