long-span
hot minute
eon
lifetime
until the cows come home
until the cows freeze over
long
abiding
imperishable
enduring
eudemic
long time
age
years
inveterately
at length
eternity
aeon
protracted
long-pending
longwhiles
forever and a day
donkey's ears
prolongedly
donkey's years
with ages
long haul
in the long term
in the long run
blue moon
durative
ages
grip
donkey's
longue durée
for the long haul
time out of mind
drawn-out
light year
coon's age
crow's age
perdurable
undestroyable
durable
dog's age
indestructible
longish
all the while
secular
take time
extended
interval
forever
period
prolonged
stretch
over
long run
o'er
momentaneous
momentary
fleeting
fugitive
prolongably
longstandingness
at last
long-lasting
no end
lengthen
overprotracted
for long
overlong
long-termly
Rome wasn't built in a day
continuing
chronic
make old bones
month of Sundays
longtime
longitudinal
yearslong
long-range
macrobiotic
overtime
durate
prolong
multiyear
longsomely
long-drawn-out
drawn out
superlong
lasting
minute
long as one's arm
old