I don't know how many there are in the world or how many there are in the GOM.
I can see the rig numbers in the GOM, but don't know how many are deepwater rigs.
How long it takes to build depends on how long it takes to design one. If they use a previous design, that would cut it down drastically. Just the purchase work and build. And you have a few months for the shipyards to figure out what to bid. Steel prices and availability affect the length of time too.
The hull is massive and very complicated on the inside. The topsides can be built in modules and set when each is finished.
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