long-termly
durative
long
long game
secular
make old bones
enduring
imperishable
abiding
light year
inveterately
long-span
longue durée
at length
protracted
long-pending
eon
lifetime
for the long haul
for the ages
hot minute
until the cows freeze over
with ages
until the cows come home
yearslong
dog's age
longwhiles
lengthen
long haul
durable
donkey's years
indestructible
undestroyable
perdurable
donkey's ears
hyperpersist
longsomely
lock up
eternity
eudemic
deep
tick past
longstandingness
permanent
overrun
longevous
longirostrate
plurennial
perpetual
permanently