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