What is the average length of time required for a TELEX sent by Inmarsat-C to be delivered to the addressee?

The average delivery time for a message sent by Inmarsat-C is commonly cited as being around 10 minutes. This timeframe reflects the operational characteristics of the Inmarsat-C system, which is designed to transmit messages efficiently via satellite. Inmarsat-C operates in a store-and-forward mode, meaning that messages are first sent to a satellite, where they are stored and then forwarded to the intended recipient once the communication path is available. This processing can introduce some delay, but typically, message delivery is completed within that 10-minute window for standard TELEX messages.

While the other options present different scenarios or communication methods, they do not accurately represent the expected performance time for Inmarsat-C TELEX communications. For instance, real-time connectivity is not a characteristic of Inmarsat-C, as it does not provide continuous connectivity like some other systems, which negates that option. Additionally, the specifics regarding the delivery time for fax and data messages are pertinent, but they are not the focus when discussing TELEX messages, making the reference to a longer delivery time irrelevant in this context. Thus, the focus on the average delivery time of about 10 minutes for TELEX exactly aligns with the established operational benchmarks for Inmarsat-C communications.