Negotiable Instruments Act Article 45

A bill payable at a fixed period after sight shall be presented for acceptance within 6 months from the date of drawing.The time limit referred to in the preceding paragraph may be shortened or extended by the drawer, as they see fit, by a special agreement provided that the extension, in any case, may not be longer than 6 months.
中文原文 票據法第45條
見票後定期付款之匯票,應自發票日起六個月內為承兌之提示。
前項期限,發票人得以特約縮短或延長之。
但延長之期限不得逾六個月。

English translation for reference only; the Chinese text prevails. Not legal advice.