We can't really assign a specific number to the number of times in which we study the word of God. Studying and understanding of the word of God is a continual exercise that we all as Christians are supposed to carry out.
Every day of our lives there's one thing or the other that God has for us and it is contained in His Word. A particular verse of the scripture can keep on telling us different things for each time we go through it. Every time we go through the word of God there's something it does to us in our spirit because the Word of God is what serves as food and nutrition to our spirits just as the physical food we eat serve as nutrition to our body. If we focus only on the body and neglect the spirit then we are not doing ourselves any good.
We should never underestimate the word of God. JESUS speaking in the book of John say that the word which he speaks to us are spirits and life. The Bible is a means through which God communicates to us. Every single time we study and meditate on it it brings our spirit man to life. The Word of God should be our daily diet for our spirit