Coming soon, or maintenance
These are not two names for one thing, and picking the wrong one is expensive.
Coming soon is a site that does not exist yet. The page answers 200, because the address is meant to be found, shared and indexed while you build.
Maintenance is a site that exists and is briefly away. The page answers 503 Service Unavailable with a Retry-After header, which tells a crawler to come back rather than to treat your holding page as the site's new content. A fortnight of 200s on a maintenance page is how a site loses rankings it spent years earning.
The Retry-After is worked out from your opening time when you have set one, so the number is true rather than a guess. Without one it says an hour; further away than a day it says a day, because a crawler ignores anything longer.
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