忙活了半天英语怎么说

"忙活了半天" (máng huó le bàn tiān) 可以翻译为 "to have been busy all day" 或 "to have been working hard all day." 这个说法来自汉语，没有直接的英文表达。
在英文中，可以用其他表达来表示 "忙活了半天" 的意思，例如：
I've been working nonstop all day. (我整天都在忙碌不停。)
I've been busy as a bee all day. (我整天都很忙碌。)
I've been going at it like crazy all day. (我整天都在忙得不可开交。)
例句：
I've been busy all day preparing for the presentation. (我整天都在忙着准备演讲。)
She's been working hard all day on her project. (她整天都在忙着做自己的项目。)
He's been busy all day with meetings and phone calls. (他整天都在忙着开会和打电话。)