妈妈让小明给客人烧水沏茶。洗水壶要用1分钟，把水烧开要用15分钟，洗茶壶要用1分钟，洗茶杯要用1分钟，拿茶叶要用2分钟。小明估算了一下，完成这些工作一共要花20分钟。为了使客人能早一点喝到茶，按你认为最合理的安排，多少分钟就可以沏茶了？

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