ずっと
Usage
ずっと means that a state or action is ongoing, from one point in time to another point in time. "All the time, all along; all the way, all through -; throughout -; ever (since); never (since)"
Examples
今日は朝からずっと雨が降っている。
Today, it has been raining continuously since the morning.
何年も前からずっと戦争が続いている。いったいいつ終わるのだろうか。
The war has been ongoing for many years now. I wonder when it will finally end.