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DAC Basic question

Other Parts Discussed in Thread: DAC7654

In a SPI interface DAC with sampline rate 100KSps, like the DAC7654.

How often should the data be written to the DAC from a uC.
The SPI speed is usually in MHz.
Do you write data, at say 1MHz. Do you have to wait for the DAC to read out all the bytes or  can you just keep writing?