This is the 4466th most frequent Chinese word.
整整
"整整" means "fully" or "exactly," emphasizing completeness or totality.
In this sentence, 整整 emphasizes the completeness or entirety of the specified duration, expressing that the full two hours were spent waiting.
我等了整整两个小时,他才出现。
I waited for a full two hours before he showed up.
Here, 整整 highlights the exact time period of five years, stressing the significant effort and full duration involved.
她整整学了五年才掌握这门技能。
She dedicated exactly five years to mastering this skill.
In this instance, 整整 conveys the idea that the entirety of the fifteen minutes was consumed due to the delay.