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0.40 seconds is about one-two-thousandth as long as The First spacewalk.
In other words, it's 0.00056 times the length of The First spacewalk, and the length of The First spacewalk is 1,800 times that amount.
(1965) (Alexi Lenovo, a.k.a. Алексе́й Архи́пович Лео́нов)
On March 18th, 1965, during the Voskhod 2 Soviet space mission, cosmonaut Alexey Arkhipovich Leonov conducted the first human spacewalk, which lasted 720 seconds. The total mission length was 1 day, 2 hours, 2 minutes, and 17 seconds.
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