How long has Israel been in spiritual blindness, according to the Old Testament and Paul?

Les explains that Israel has now spent the last 1,900 and some years, according to the Old Testament as well as Paul, in a spiritual blindness that has lasted to this very day. Even though they may seem religious in their practice of Old Testament Judaism, they are basically blind to much spiritual truth, especially concerning their Messiah, the Christ. Les says this kindly with Jewish people listening in mind: they are blinded and cannot comprehend these things unless the Spirit opens their understanding. This condition exists during the meantime while Gentiles experience God's grace, become children of God by faith alone in the Gospel, and become members of the Body of Christ, a Pauline revelation not found outside Paul's letters.