It should be fine for the traxxas parts: they are nylon and won't suffer from the heat. And it's correct that the more moist it contains the less brittle nylon will be
For other plastics it could be of no use; if they don't contain water, or for some plastics even harmful. Some plastic is stress formed (example Parmas kydex bumpers) or has a lower melting point (YZ10 bulkhead caps)... and the part will loose it's correct shape.
People used to cook the Tamiya plastic parts back in the days too, but with their palstic it would only release some residual stress from the injection moulding process
People who have experimented with dying nylon parts can tell you more regarding the time. Typically the dye will go deeper and last longer , the longer the parts are kept in the (boiling) water.
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