Stay logical,
1. What's the time gain on approach when at 330 kts at 20 nm or at 250 Kts. Personally i think is't not worth it for that reason.
I do fly high speed approaches from time to time simply because it's a true joy.
2.On the way out it should most definitely be no problem if allowed by ATC AND it even saves fuel if tyou do fly above 250 kts below 100.
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Smooth Trimmer