also: ずーっと · ずうっと
continuously; the whole time; all the way
Describes an action or state that continues without interruption over a period of time or distance.
I was at home the whole day yesterday.
駅からここまでずっと歩いてきた。
I walked all the way here from the station.
Used in comparisons to emphasize a large difference, often with より or のほうが.
こっちのほうがずっといい。
This one is much better.
彼は私よりずっと背が高い。
He is far taller than me.
far away; long ago; long before/after
Indicates a great distance in space or time; often used with 前, 後, or 昔.
ずっと昔にここに住んでいた。
I lived here a long time ago.
彼の家はここからずっと遠くにある。
His house is far away from here.
Describes moving or going without detour; often used with verbs like 行く or 進む.
この道をずっと行くと駅に出ます。
If you go straight down this road, you'll reach the station.
I've been studying Japanese continuously.
This year is much colder than last year.
I walked all the way to the station.
ずっと emphasizes continuity or comparison ('all along', 'by far'), whereas 長らく simply states a long duration without the continuous or comparative nuance.