Carwajalca comments on Harry Potter and the Methods of Rationality discussion thread, part 16, chapter 85 - Less Wrong
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It's been on its way since April 1973 (for right about 39 years), so assuming a steady speed, it would've passed the six-hour limit roughly 19,5 years ago, or in late 1992.
Pioneer 11 is moving at a speed of 11.4km/s relative to the Sun. The Earth's orbital speed is around 30km/s. Hence it's possible that the Earth-Pioneer distance increases to over six hours for a while and then drops again.