Japanese · Pronunciation Guide
shuu — one syllable, two beats, with the u held long and the lips completely unrounded.
shuu
Two counts inside one syllable, a shape English doesn't have. Since the word almost always appears in compounds — 今週, 来週, 週末 — that length has to survive being absorbed into a longer word, which is where beginners most often lose it.
Listen: 週
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今週はとても忙しいです。
Konshuu wa totemo isogashii desu.
This week is very busy.
Listen: 今週はとても忙しいです。
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今週はとても忙しいです uses the compound 今週 (ko-n-shu-u), four morae with a nasal beat and then the long vowel. So two of that word's four beats are things English wouldn't count at all, and delivering only two of the four is the standard beginner outcome.
"shoo" — one beat, lips pushed forward — is the English default, and it's wrong on both counts. Spread the lips so the vowel loses its "oo" quality, then hold it for two full counts. The hiss should also be lighter than English sh; Japanese pushes much less air through it.