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Re:HMM Rotterdam appears to be diverting to avoid congestion... by eloff on Friday March 26, 2021 @08:14AM (#26591126)
The canal was expanded in 2015 to support bigger ships. You can lookup how long that took and treat it is a lower bound because this would not have most of the work already done like when expanding the existing canal.
Re:HMM Rotterdam appears to be diverting to avoid congestion... by midasuni on Friday March 26, 2021 @08:25AM (#26591237)
Dredging a 35-kilometers-long and 24-meters-deep shipping route in a year

https://www.magazine.boskalis.com/issue02/suez-canal-expansi...

Re:HMM Rotterdam appears to be diverting to avoid congestion... by eloff on Friday March 26, 2021 @09:24AM (#26591814)
Dredging is so much easier than digging, but it still works as a very conservative lower bound. That's 3km a month, so a diversion of 6km would take at least 2 months.

But earthworks of that size have to be planned and approved and the labor organized. It could never be done in that time frame.