exposure 152sb

Hi
I found a line in the Polymer Manual which reads:
21-step Exposure Scale 17-18.
Does it mean that I need to expose the photopolymer long enough to make 17-18 steps fully filled? As I calculated by 7 fields rule it takes 16 min. I doubt that this exposure is suitable for the polymer. What’s your suggestion?

image: 152sb-datasheet-boxcar-1.jpg

152sb-datasheet-boxcar-1.jpg

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Could you explain what you mean by the 7 fields rule please? I assume it may have something to do with the fact that the density scale is a logarithmic scale?