a couple of hours
→두서너 시간

[예문]
A : I stayed up all night, so I'm really tired.
A : 어제 밤을 새웠더니 너무 피곤하다.
B : What did you do?
B : 뭘 했는데?
A : My mom was very sick so I took care of her.
A : 엄마가 아프셔서 병간호를 했거든.
B : Sorry to hear that. A couple of hours' nap will do you good.
B : 유감이다. 두서너 시간 낮잠을 자고 나면 괜찮아질 거야.