My Response is WRONG. I double counted the square footage. See response further down in thread.
Not exactly.
The entire formula is:
720 min / 4.5 Current Density x .13 sq/ft x Desired thickness in mils = Anodizing time.
To get a surface 1 mil thick (25.4 microns) you would anodize for 20.8 minutes. Typically 1 mil thickness is a VERY GOOD thickness as in anodizing, thicker doesn't equate to better, except in specific applications.
If you anodized for 60 minutes, your thickness would theoretically be 3 mils (or 76.2 microns). You probably didn't get anywhere near this thickness as a number of other factors, such as dissolution rates, enter the equation.
Generally speaking, if all conditions remain the same, you should get similar results at 20.8 minutes. There may be a slight variation in the deepness of the color as the layer would be thinner and absorb less dye but it is difficult to speculate how much of a difference (if any) there would be. The only way to be certain is to try it.
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