My TOD light still starts flashing after about 20 minutes of driving. It's never bothered me enough to check for codes. This has been going on for several years now with no adverse effect (of course for the last year I've been running locking hubs too so that helps).
The light is just telling you that you aren't getting any drive to the front. It won't be able to tell you that your transfer case is about to explode.
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