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DAC60004: Clarification of device operation regarding maximum update across all four DACs.

Part Number: DAC60004
Other Parts Discussed in Thread: DAC8830, DAC8871, DAC81001

Could you clarify the overall update rate across all four DACs? Section 7.2 of the datasheet suggests successive DAC updates of 2.4 us, but it isn't clear what this means. I'd like to know how fast I can write new data to all four channels and then synchronously update them.
A quick calculation indicates that a single write would take 640 ns at 50 MHz, with a minimum of 25 ns SYNC high before the next write. Let's be a little conservative, so assume 680 ns times four writes, which would be 2.72 us. An asynchronous LDAC could occur 10 ns later at 2.73 us, giving an update rate of about 354 kHz. Is this the way the device works?