public String getLookbackPeriodInDays() {
        return this.lookbackPeriodInDays;
    }
<p>
The number of previous days that you want Amazon Web Services to consider when it calculates your
recommendations.
</p>

@return The number of previous days that you want Amazon Web Services to consider when it calculates your
        recommendations.
@see LookbackPeriodInDays
aws-java-sdk-costexplorer/src/main/java/com/amazonaws/services/costexplorer/model/GetReservationPurchaseRecommendationRequest.java