Japanese by Example
Learning through examples in manga

Challenge deadline with 期限

からかい上手の高木さん » Volume 4 » Page 49

During their walk home after school, Takagi presents Nishikata with an impossible challenge. When he pushes back against it, she comes up with a new challenge, which Nishikata loses. As the two reach the point where they part ways, Takagi stops for a moment.

高木(たかぎ):
「あの勝負(しょうぶ)期限(きげん)ないからね。」
"There's no deadline for that challenge."