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50% of entrants don't finish so be careful putting any faith in their facebook surveys. ;)
One way to look at it is you're more likely to need to walk a bit in TCR than any other road racing and therefore walk faster and more securely in SPD is a benefit over any potential time saved with road shoes. The one advantage road shoes might offer is a stiffer sole which some people find helps avoid hot spots.
Personally I’ve used SPD-SL twice with no major problems. I think there was a poll recently on the Facebook group and if I remember correctly at least 50% of the respondents didn’t use SPDs. Other advice would be to make sure the cleats arebrand new and you take 1 spare (highly unlikely that you’ll destroy two).