As an investor you can refer to your family members ( as in this case your wife) in the I -526 petition. If the spouse does not obtain the conditional permanent residency them the spouse may be referred to in the I-829 petition to be filed usually 3 years after the filing of the I-526 petition. The I-829 petition may take several months before their is an adjudication of the I-829. Therefore it may take 4 years before the spouse obtains unconditional permanent residency.