Japanese · Pronunciation Guide
gu-ru-u-pu, four beats — a long u in the middle and no rounding anywhere.
guruupu
Four beats for a word English delivers in one syllable. Two of those beats exist purely because Japanese breaks up consonant clusters with vowels, and one comes from the long vowel — which together make the loanword four times the length of its source.
Listen: グループ
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小さいグループで勉強します。
Chiisai guruupu de benkyou shimasu.
We study in a small group.
Listen: 小さいグループで勉強します。
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小さいグループで勉強します opens with 小さい, four morae with a long i at the front, and includes 勉強 with a nasal and a long o. So the sentence contains three long vowels and a moraic nasal, and the loanword is not the only place that needs holding.
Saying English "group" with a Japanese accent gives one beat where there should be four. Every inserted vowel is a real mora: gu, ru, u, pu. Keep all three u's unrounded — English rounds them automatically — and hold the middle one for a genuine two counts.