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[i]The NASA PAO today ranked EVAs using mixed definitions — NASA rules for NASA EVAs (battery power to repress) and Russian rules for Russian EVAS (hatch open to close), not a fair comparison. My estimate using NASA rules for all, guessed values, makes today's EVA the second longest ever. Using Russian rules (hatch open to close), however, the longest EVAs were STS-102 EVA-1 (Helms/Voss), 534 minutes; STS-49 EVA-3, 508 minutes; ISS US EVA 18 (494 minutes), and in fourth place today's (493 minutes). Using my own rules (50 mbar depress to repress) the record goes to STS-102 EVA-1 again (540 minutes), with today's in second place — 10 min longer than STS-49 EVA 3. Using time *actually outside* (egress to ingress), my estimate is that Thout and Hieb from STS-49 EVA 3 holds the record. The STS-102 EVA that scores well on the other measures fails on this one because the astronauts spent a very long time in the depressurized airlock.[/i]
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