Using only hand tools and exactly copying the work of medieval carpenters, it took 25 carpenters just ONE week to make a truss. Notre-Dame needs 36 of these. 36 weeks in total for a roof that will last 1000 years. That is far faster and cheaper than metal beams lasting 200 years. https://twitter.com/AFP/status/1281207726521978880
Correction: there seems to be only 25 trusses that need replacement. So 25 weeks of work at the very most. I am willing to bet that the last truss will take 2-3 days at most to build, once the carpenters get used to the work. So, say 20 weeks?
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