This OCTET STRING of up to 20 bytes reports how long ago the LLDP neighbor-count information was last updated, per the source description 'the time how long the information has updated.' It gives an admin a freshness indicator for the global neighbor insert/delete/drop/age counters, so they can judge whether the counts reflect recent topology activity or a stale snapshot. For example (illustrative), a monitoring script might read this value as '00:05:23' to confirm the LLDP counters were refreshed within the last five minutes before trusting a reported spike in dropped neighbors.