Commentaire sur Isaïe 40:2

for she has become full [from] her host Jonathan renders: She is destined to become full from the people of the exiles, as though it would say, “She has become full from her host.” Others interpret צְבָאָה like (Job 7:1), “Is there not a time (צָבָא) for man on the earth?”

Because its set time is complete. This means to say: either they will be redeemed at the time that the set time is complete. And this will be if they don't merit to be redeemed earlier than this. Or they will be redeemed before the time - Because, for its sin is satisfied. If their sins are satisfied with repentance and merit. Or because - For it took from the Hand of God double. That He will double their torments and punishments until the punishments and torment equal - All of its sins. For example, someone who it was decreed on him to sit in jail for ten years and get lashed ten times every day, and the jail master hits him one hundred times every day, he goes free. And so too it was in Egypt, that the hardship of the service finished the four hundred years in two hundred and ten.

Her term of service is over. Her time was over, like "Wait until this week is over", and bounds the term of service which is a limited and set amount of time