The Bible does not prescribe the time or length of prayer, but it does offer guidelines. In Psalm 88 prayer is offered in the early morning (v. 13), and in Psalm 55 prayers are said evening, morning and noon (v. 17). The author of Psalm 119 advocates prayer seven times a day (v. 164). Daniel knelt for devotions three times a day (Daniel 6:10). Jesus prayed before sunrise (Mark 1:35) and in the evening when the day’s work was over (Mark 6:46). Peter prayed at the third, sixth, and ninth hours.

Despite their aversion to prescribed formulas in the life of prayer that function as a new law, the Reformers did make general recommendations. On the basis of the Scriptural testimony Luther suggested that prayer should be “the first business of the morning and the last at night.” He advised: “Cultivate the habit of falling asleep with the Lord’s Prayer on your lips every evening when you go to bed and again every morning when you get up. And if occasion, place, and time permit, pray before you do anything else.” Calvin urged that we offer prayer “when we arise in the morning, before we begin daily work, when we sit down to a meal, when by God’s blessing we have eaten, when we are getting ready to retire.”

Just as the Christian is not bound to ritual laws that regulate the preparation for prayer, so he is not absolutely bound to set times for prayer. Yet there are times that are more appropriate for prayer than others: the gathering together for worship, the hours before work and bedtime, the time right before meals, when we need to remind ourselves of the goodness of God. But a Christian should feel free to pray anywhere, anytime, in the midst of daily work and play as well as in the solitude of his room in the early morning or late in the evening.

—Donald G. Bloesch, The Struggle of Prayer