I'm not sure if you are asking how much rain would need to fall to cover the mountains, or how much water could conceivably fall as rain. You could start with the highest recorded rainfall figures here: https://edition.cnn.com/travel/article/extreme-weather-records/index.html Greatest rainfall in 24 hours = 1.825 m. So in 40 days and nights that would be 73 metres (about 240 feet?) Greatest rainfall in 1 minute = 31.2 mm. In 40 days and nights that would be 1797 metres (just under
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