The process I linked to said a 15 minute run was good. Another source mentioned a long run tended to get "feathers" on the part from excess zinc that just comes off in the rinse and polish. The parts get a soft grey color as the zinc deposits on them. Areas that are shadowed (not visible to the anodes) tend not to get that nice grey color, but are darker. Then a rinse and scrubbing with a brass brush gets them nice and shiny. A second 15 minute run gets a good layer of zinc on them before a final rinse and scrub.

I haven't turned in to that mad scientist yet, but give me time. LOL

For Carl: Here's a photo of an original hood support next to the one I zinc plated. Notice the original plating right around the rivet of the one in the foreground versus the bare de-rusted steel to the right. Not much difference in appearance from the new zinc.
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Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.