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5400 seconds = exactly 90 minutes
5400 = 60×90. 90 minutes in seconds — a standard football match, university lecture, one orbit of the ISS around Earth.
Science
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5400 years ago — invention of the wheel
Around 3400 BC (5400 years ago), the wheel appeared in Mesopotamia — first the potter's wheel, then the transport wheel. One invention changed the speed of all civilisation.
History
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Sum 9 and structure 54 = 6 × 9
5+4+0+0=9. And 54 = 6×9 — the product of two multiples of three. Nines permeate the number both as sum and internal structure.
Numerology