the afternoon of May ninth, or sometime between the eleventh to fourteenth in the afternoon, or the morning of the fifteenth
ーthe afternoon of May ninth, or sometime between the eleventh to fourteenth in the afternoon, or the morning of the fifteenth
「５月９日の午後、１１日〜１４日の午後、１５日の午前」
例：
I'm available to meet with you in the afternoon on May ninth, or sometime between the eleventh to fourteenth in the afternoon, or the morning of the fifteenth.
「５月９日の午後か１１日〜１４日の午後、または１５日の午前に会うことができます」
ご参考まで！
The afternoon of May the 9th, the afternoon of 11th to the 14th, and the morning of the 15th.
ご質問ありがとうございます。
↑は文章にしましたが、箇条書きで書くこともできます。
文脈にもよりますが、例えば時間があるときを相手に知らせたいときは：
"I am available during the following days and times."＝「下記の日時が空いています。」
・May 9th (in the afternoon)
・May 11th~14th (in the afternoons)
・May 15h (in the morning)
ご参考に。
カナダ 
アメリカ合衆国 
