Every day. 

“But his delight is in the law of the Lord, And in His law he meditates day and night. He will be like a tree firmly planted by streams of water, Which yields its fruit in its season And its leaf does not wither; And in whatever he does, he prospers.”
‭‭Psalms‬ ‭1‬:‭2‬-‭3‬ ‭NASB1995‬‬
https://bible.com/bible/100/psa.1.2-3.NASB1995