This is the 2873rd most frequent Korean word.
정도다
"정도다" means "to be at a certain level or degree."
The word '정도다' is used to emphasize the extent or degree of an action, here to describe the exceptional speed of reading.
읽는 속도가 정말 빠를 정도다.
The reading speed is so fast.
Here, '정도다' expresses the level of proficiency in his artwork, indicating it is comparable to professional quality.
그의 그림은 전문가로 착각할 정도다.
His drawings are to the extent one might mistake him for a professional.
In this context, '정도다' indicates the degree of lateness in waking up, showing it was significant enough to risk a missed train.