used to ask about the duration or length of time

not long after; soon after a specific event or point in time

referring to a significant or extended period of duration

quite a while

long-term, enduring, or permanent

not long ago

continuing or enduring for a long period of time; protracted or permanent in nature

not long ago; in the recent past

continuing for all future time; eternally

already a long time

long-standing; age-old (tradition, history, etc.)

for a long time; for ages

to have not experienced or seen something for a long period of time

for a very long time

to wait for a long time

Long time no see.

a good while; a long time

permanent; permanence

enduring while the world lasts; eternal

as time passes or in the fullness of time, often leading to a gradual change or development

distant or long-ago in time; ancient

A polite honorific used upon meeting someone for the first time to express that one has long heard of their reputation; it's an honor to meet you at last.

with the passage of time; over time

having existed for a long time; originating from a long time ago

remaining, enduring, or staying functional for a long period of time

long-term peace and stability (of governments)

persistent and long-lasting over a significant period of time

a war of long duration or a strategic conflict intended to wear down the opponent over time

to stay for a long time

able to withstand wear, pressure, or damage; lasting for a long time

old and in a state of disrepair due to neglect over a long period of time

long and drawn-out over a period of time

to have long experience of or to go through something repeatedly

a medical condition that persists for a long period of time; the state of being ill for a long duration

prolonged (applause, cheering, etc.)

lasting as long as the world exists; enduring as heaven and earth

Having enjoyed a high reputation for a long time; well-established and prestigious for excellence or quality.

having occurred or started a long time in the past; long since

well-tested and tempered over a long period of time, especially regarding experience or character

a long period of separation

a long time; long-lasting

after a long time; over a long period

to meet again after a long period of separation

Kubo (Japanese surname)

to have heard of someone's great reputation for a long time (polite greeting)

long-lasting and not showing signs of decline or fading

a long illness makes the patient into a doctor

Japanese surname and place name Ōkubo

I have been looking forward to meeting you for a long time (idiom)