The Rule of St. Augustine has a very short chapter on prayer, just four parts, this is part one:

Be assiduous in prayer (Colossians 4:2), at the hours and times appointed.

What does it mean to be assiduous in prayer?
Merriam-Webster’s dictionary defines assiduous as “marked by careful unremitting attention or persistent application”.

Do you have a specific time of the day to pray? (Upon waking, after dinner, before sleep?)
Are are you persistent in keeping that time?
Do you give Jesus (or God the Father or The Holy Spirit) your unremitting attention while you pray?

While talking to God, or praying throughout the day is a great practice, having a specific time to grow in relationship with or just relax in the presence of the Holy Trinity is something that everyone should do. No matter when you pray or how long you pray for, the choice is yours but make the decision to have a specific time to pray. Then be assiduous about your prayer.