昨天我的约会不太顺利，她让我等了足足两个小时。 — Chinese Grammar HSK 6 flashcard

Yesterday my appointment was not going well. She made me wait two full hours.

zuótiān wǒde yuēhùi bù tài shùnlì，tā ràng wǒ děng le zúzú liǎng gè xiǎoshí 。

Expressing "a full" with "zuzu"

足足 + Verb / Verb + 足足