You can see how each Virginia takes a different amount of time to assemble in each bay.
Hence my guestimate of 6-9 months to assemble an SSN in China.
But now the US are stuck at current production levels, even though spare bays are theoretically available.
It looks like they've run out of skilled labour to ramp upwards.
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My gut says a lot of that capacity at Huludao will be used to produce more than just SSNs or SSBNs.
If you think about it, UUVs will soon be as important as airborne drones today.
It make sense to build out spare capacity as a contingency.
Look at the CCTV newsreel where they report production capacity of up to 1000 cruise missiles per day, if this is required.
But actual production is nowhere near this level.
They need to build more production bases for SSNs and SSBNs, rather than concentrating in the same location.