When to pray…
Evening, and morning, and at noon, will I pray, and cry aloud: and [God] shall hear my voice.
And it came to pass in those days, that he [Jesus] went out into a mountain to pray, and continued all night in prayer to God.
Watch ye therefore, and pray always, that ye may be accounted worthy to escape all these things that shall come to pass, and to stand before the Son of man.
1 Thessalonians 5:17
Pray without ceasing.
But we will give ourselves continually to prayer, and to the ministry of the word.
Rejoicing in hope; patient in tribulation; continuing instant in prayer;
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.