'Night and Day' in the Bible

Therefore be on the alert; and remember that, night and day, for three years, I never ceased admonishing every one, even with tears.

For you remember, brethren, our labour and toil: how, working night and day so as not to become a burden to any one of you, we came and proclaimed among you God's Good News.

while night and day, with intense earnestness, we pray that we may see your faces, and may bring to perfection whatever may be still lacking in your faith?

nor did we eat any one's bread without paying for it, but we laboured and toiled, working hard night and day in order not to be a burden to any of you.

A widow who is really in need, friendless and desolate, has her hopes fixed on God, and continues at her supplications and prayers, night and day;

I thank God, whom I serve with a pure conscience--as my forefathers did--that night and day I unceasingly remember you in my prayers,