Utilizing this equation depends on whether you want to analyze the rate for selected portions of your experiment time or the entire duration of the experiment. This is important, because your rate is changing, and if you average it out, your averages may not reflect the actual rate per hour.

All three of your samples appear to show a significant change in their rate, with a linear growth rate after 5 minutes but a significantly higher rate prior to that. For example, your 1 crystal sample, assuming it starts at a diameter of 0, shows a growth of 11mm in 5 minutes. Projecting this over the course of one hour, you would multiply both values by 12, to get...

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