public void setLookBackPeriodInDays(Double lookBackPeriodInDays) {
        this.lookBackPeriodInDays = lookBackPeriodInDays;
    }
<p>
The number of days for which utilization metrics were analyzed for the instance.
</p>

@return The number of days for which utilization metrics were analyzed for the instance.
aws-java-sdk-computeoptimizer/src/main/java/com/amazonaws/services/computeoptimizer/model/InstanceRecommendation.java