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The launchpad is 2800 m away from the building where Ariane 5 is assembled. Based on the Ariane 5 user manual, Section 7.5.5, Figure 7.5.5.4.b, the Ariane 5 transfer to launchpad happens one day before the launch. How long does it take for Ariane 5 to go from hangar to launchpad?

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For the upcoming JWST launch - which is presumably representative - the rollout will take a couple of hours:

Ground crews at the jungle spaceport in French Guiana planned to transfer the European Ariane 5 rocket with the Webb telescope on top to the ELA-3 launch zone Wednesday. That rollout, expected to take about two hours, has been delayed to Thursday.

(Spaceflight Now)

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