וַיִּשְׁמַ֥ע לָהֶ֖ם לַדָּבָ֣ר הַזֶּ֑ה וַיְנַסֵּ֖ם יָמִ֥ים עֲשָׂרָֽה׃
Он послушал их в этом вопросе и судил их десять дней.
Ibn Ezra
[Daniel 1:14] Vayishma (וַיִּשְׁמַע - And he listened/agreed): Yefet ben Ali said: that every day he [the guard/Meltsar] would observe their appearance (lit. "see their faces") throughout the ten-day period (lit. "until ten days").