Refers to the sixth day of a month or a period of six days. Like other specific day counts, this reading 'muika' is distinct and crucial for accurately expressing dates and durations in Japanese.

月(つき)の六(むい)日(か)目(め)、または「六(むい)日(か)間(かん)」のように六(むい)日(か)間(かん)を数(かぞ)えるときに使(つか)われます。