There is only so much time in the day for answering letters.
白天只有这么多时间用来回信。
I feel terribly sorry for missing the chance of answering your letter in time.
非常抱歉，我没有及时回信。
I must apologize for not answering your letter in time.
我为我延误回信向您道歉。
I have been some time in answering this question.
我想了一些时候才回答这个问题。
I have been some time in answering this question.
我想了一些时候才回答这个问题。
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