There are two intervals used to determine how frequently Onsite Manager and Device Managers update information:
Device Discovery The Device Discovery interval is how long an Onsite Manager will wait following a network scan before initiating another. By default, 5 minutes will elapse between the end of a scan and the beginning of the next one.
Asset Discovery The Asset Discovery interval is the time frame within which all known devices must have asset data collected. Data collection for all devices is distributed through the entire period. By default, each device will have its assets collected once every four hours.
You can configure these scan intervals in Service Center, by clicking Configuration, and then clicking Site Management. Click the site name, and then click the Network Discovery tab.