Why even with network time protocol no guaranteed bound is given different between two clocks?

Even with the Network Time Protocol (NTP), no guaranteed bound exists between two clocks due to factors such as network latency, variable transmission delays, and the inherent limitations of clock synchronization techniques. NTP can adjust clocks to be within milliseconds of each other, but the precise timing can still be affected by unpredictable network conditions and clock drift. Additionally, since NTP relies on averaging measurements from multiple servers, it cannot account for all possible discrepancies in real-time. Thus, while NTP improves synchronization, it cannot provide absolute guarantees on the time difference between clocks.