Hold over time has nothing to do with inflight procedures, due to the fact, that the fluid will be removed on the moment of rotation (at least most of it)
To my knowledge it's less a problem in flight but the degradation of the deice/ anti ice fluids on the ground. The ice pellets can adhese to the Type I, II, III and IV fluids and mix with them or can degrade the thickener molecules on impact. Therefore there are no HOT established for that kind of precip.
To answer your question, we are following these regulations...
Please correct me if I'm wrong
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