It depends on what you are doing with the drives and how quick you need them to stop or respond. on a job with 12 drives controlling a mixture of fans and conveyors I used 150msec but on similar setups with more drives when response is not critical I would probably try up to 250msec. I would not bother staggering unless you have gazillions of drives
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If it can be put off till tomorrow are you sure you need to do it at all
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