When you are purchasing items for the estate and it state old 6 hours does that mean it will mature..

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What does it mean when the construction clock shows for example, 4 hours..

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The font is deceiving. It does not say "old", It says 01 d, meaning 01 days, exactly 24 hours. So 01 d and 6 h = 24+6 =30 hours.

What you are reading as "old" is actually "01d" (zero, one, d) meaning 1 day. So 01d 6hrs will take 24hrs + 6hrs = 30 hours.