때만

only when

→ 때
phrase Uncommon #14,545
only when Attaches to a time or event to mean that something happens only then.
KO: 비가 올 때만 우산을 써요.
EN: I only use an umbrella when it rains.

사격 연습할 때만?

Only during target practice?

— Kill Boksoon (2023)