The specific time has to do with when you should have your quiet time and how long it should be. The general rule is this: The best time is when you are at your best! Give God the best part of your day, when you are the freshest and most alert. Don't try to serve God with your leftover time. Remember, too, that your best time may be different from someone else's. For most of us, however, early in the morning seems to be the best time. It was Jesus' own practice to rise early to pray and meet with the Father. In the Bible many godly men and women rose early to meet with God. Some of these were: Abraham, Moses, Job, Hannah, Jacob, and David. Whatever time you set, be consistent in it. Schedule it on your calendar; make an appointment with God as you would with anyone else. Make a date with Jesus!
Then look forward to it and don't stand him up. A stood-up date is not a pleasant experience for us, and Jesus does not like to be stood up either. So make a date with him and keep it at all costs. If you've never had a consistent quiet time before, you may want to start with 5-10 minutes and let it grow naturally. Our ultimate aim is to know that we’ve met with God then stay in his presence as we go about our day.
“Before daybreak the next morning, Jesus got up and went out to an isolated place to pray.”
Mark 1:35 NLT