free period

US /ˈfriː ˌpɪr.i.əd/
UK /ˈfriː ˌpɪr.i.əd/
"free period" picture
1.

空き時間, 自習時間

a period during the school day when a student does not have a class and is free to do other things

:
During my free period, I usually go to the library to study.
空き時間には、たいてい図書館に行って勉強します。
Do you have a free period next?
次は空き時間ですか?