He continues to be is OK, but I would add this to the explanation. 8 or 9 pm is very late to stay in the office. It's a surprise that he stays so late.
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Clive8 or 9 pm is very late to stay in the office. It's a surprise that he stays so late. This is what 'still' tells us.That's the idea because the workers leave at 5:00. Would it work if I say, 8 or 9? Will it be better to say, 9 or 10, or it really doesn't matter?