Place this clip just after the date reveal in your timeline, preceded by a sudden suspense build-up to set up the number, then follow it with an oh my god wow reaction from a second voice for the payoff beat.
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A short voice clip of a speaker emphasising the phrase 'over 20 years', letting the number do all the work. It gives a listener a mix of disbelief and weary amusement, the feeling of realising just how much time has passed while everyone was not paying attention.