To me there is really nothing like how many times we should study God's word. I mean the is no stipulated number of times to study God's word. As matter of fact as Christians we should always study God's word. That is a life long process. You don't have to stop as long as you still can.
King James Bible John 15:7
If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you.
John 8:31 ESV
So Jesus said to the Jews who had believed in him, “If you abide in my word, you are truly my disciples,
Lamentation 3 vs 23
They are new every morning; great is your faithfulness