As a retrieval system, based on the following information:

Month: March 2023, Target: call duration, data: the call duration in March 2023 is 245. Month: April 2023, Target: number of calls, data: the number of calls in April 2023 is 987.
Month: April 2023, Target: call duration, data: the call duration in April 2023 is 765.

Please answer the question concisely: cumulative call time in March Your answer should have exactly 10 paragraphs. Make sure that the first paragraph starts with the word "ways" and that each paragraph is separated by two new lines.
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