long (time)
lasting or taking a great amount of time

check the related keyword:
long (distance, length)

lasting

great

amount

time

lasting
long time
for a long time
duration of time

arduous trek
long journey on foot
travel over land and water
go on a long arduous journey, typically on foot

to travel
to journey
make a journey over a
long period or a great distance

lasting
durable
enduring
last for a long time

workaholic
a person who compulsively works
excessively hard and long hours

longevity
long life

longevity
long life

to reach far
long-standing influence
carry out for a long time

deliberation
think carefully
long and careful consideration

long-drawn-out
remote in time or space

old, original
long-standing
inborn, inherited

destined
long-harbored
long-cherished

long-cherished wish
long-standing ambition

oath of eternal love
solemn pledge of love
to pledge undying love
vow between lovers that their mutual love
will last as long as the mountain and the sea

to part, separate
leave for a long time

old friend
friend parted for years
friend dead long time ago

old friend
a friend knowing for a long time

finally
at last
eventually
ultimately
in the end
after a long time,
typically when there has been difficulty or delay

come to the end of one's patience
cannot stand provocation any longer
driven beyond the limits of forbearance
If this can be endured, what else cannot

boil for a long time

old, preserved for a long time

long in time

long and continuous rain

lingering, loitering
lasting for a long time or slow to end