Reading the Scriptures is very important, as is prayer, the reading of the commentaries of the Fathers on the Scriptures, reading the lives of the saints, fasting, giving alms, attending services, etc. It is all very important. To what extent one can and should do each depends on the person, their "spiritual condition", state in life, time available, etc. The first priority is to have a good spiritual father, one who you can guide you to salvation. He will help you figure out to what extent, in what combintation, and to what degree you should read, pray, fast, etc. This will be based on what you need to save your soul, as opposed to an arbitrary or theoretical one size-fits-all requirement.
That being said, probably most read the lectionary readings every day, while others may read one chapter a day from the New Testament instead of or in addition to this.