noun
moment; very short time
A somewhat literary or formal word for a brief instant. In everyday speech, ちょっとの間 or 一瞬 are more common.
寸時も目が離せない状況だった。
It was a situation where I couldn't take my eyes off it even for a moment.
寸時の猶予も許されない。
Not even a moment's delay is allowed.