Thanks IChris...so in looking at the chart, I am guessing the times I am reporting corresponds to A on the graph in the 8 second or so range. I am a little confused by your interpretation of b as "Is safety shut off." Do you mind explaining a tiny bit more?

Last winter my pre-glow times corresponded more along the lines of the top (b) part of the graph.

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97 S500 (90,000 miles) - wife's car
87 300D (298,000 miles and a replacement #14 head)
94 Suburban K2500 - need something to haul firewood
83 300SD (343,000 miles) (sold)