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You can improve the user experience by these two steps:
(1) provide a hint message for your user: "we recommend you to upload the audio within 90 secs or 210 words limit." So that the user understands how to interact with the bot properly. The number is based on the assumption from the internet: average Speaking Speed Rate is 150 wpm and the average word in the English language is 4.7 characters. Feel free to adjust it accordingly.
(2) Overwrite the default handling: This documentation is showing you how to overwrite the default error handling by updating the fallback intent setting. So that the user can receive the relevant message.
Maximum utterance length
Defines how long Amazon Lex V2 waits before speech input is truncated and the speech is returned to your application. Default this is 13 seconds. You may need to set max-length-ms to a particular number of seconds, so that user does not talks something that is not more than 1024 chars.
https://docs.aws.amazon.com/lexv2/latest/dg/session-attribs-speech.html#voice-input-time-out
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