#Webb will be completely ready for scientific observations about 6 months after launch. Most of that time is taken up with focusing the telescope and making sure everything is working as planned.
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How long will it take signals to travel to/from JWST once it's in final orbit?
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Between 5 and 6 seconds each way, about 11 seconds round-trip (at 300,000 km/sec of course!).
End of conversation
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