If you view your time spent alone with God as an appointment to be kept in your daily calendar, you will be less apt to miss or skip it. There is no “right” and “wrong” time of day. I prefer having my devotions first thing in the morning as this is the least likely time of day for an interruption. I seldom receive a call from a friend at 6:00 a.m. Whatever time of day you choose, let it be the best time of day for you. Perhaps a lunch break fits better into your agenda.