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某机电安装公司项目部承建的雨水管道工程管线总长为1000m，采用直径为600mm的混凝土管，柔性接口；每50m设检查井一座。位于距地表下4m，无地下水，采用挖掘机开槽施工。 该项目部根据建设单位对工期的要求编制了施工进度计划。编制计划时，项目部使用的指标见下表。 考虑管材进场的连续性和人力资源的合理安排，在编制进度计划时做了以下部署： （1）挖土5日后开始下管、工作； （2）下管、200m后砌筑检查井； （3）检查井砌筑后，按四个一组（200m）对沟槽回填。 项目部编制的施工进度计划见图2-7（只给出部分内容） 。 工程实施过程中，挖土施工10日后遇雨，停工10日。项目部决定在下管、工序采取措施，确保按原计划工期完成。 本工程计划总工期需要多少天？
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