German · Pronunciation Guide
ZEKS, rhyming with English wrecks. The s at the start buzzes like a z, and chs is simply 'ks' with no throaty scrape at all.
One syllable, made abrupt by the consonant cluster shutting it. Compare sechzehn and sechzig, where the s vanishes and the ch turns into a genuine ich-laut: the stress stays on sech- throughout, but the sounds themselves rearrange.
Listen: sechs
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Ich bin um sechs zurück.
I'll be back at six.
Listen: Ich bin um sechs zurück.
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Ich bin um sechs zurück tells the time with um and pairs nicely with zurück, which opens on the ts of z, carries the unstressed prefix zu-, and puts its beat on RÜCK with the short front-rounded ü. That final ck is a plain k.
Two spelling reflexes fight each other here. English speakers hiss the initial s, where German voices it into a z in front of a vowel. And having just been taught that ch is a throaty scrape, learners dutifully apply it and produce something like 'zekh-s'. In this particular word chs is flatly 'ks' — nothing scrapes.