Do I need to say “o’clock” after each time? Tell me, please, how to pronounce the following sentence:
From 9.00 to 10.00 - registration of conference participants
And how to say:
From 12.00 - to 14.00
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Sign up to join this communityDo I need to say “o’clock” after each time? Tell me, please, how to pronounce the following sentence:
From 9.00 to 10.00 - registration of conference participants
And how to say:
From 12.00 - to 14.00
No. When it is clear you are talking about a time (as it is here) "o'clock" is optional, and often omitted.
So "From 9 to 10" would be the common way of reading that.
Your second example is most commonly "From 12 to 2".
In the US, 14:00 is typically only used by the military (and would be said "fourteen hundred" or sometimes "fourteen hundred hours", while 9:00 would be "oh nine hundred:). For civilians, it would be said "twelve to two" or "noon to two" with "PM" (usually uppercase) added if there's possible confusion about the event lasting until 2:00 AM.
In a written schedule, it could most efficiently be written "9:00 - 10:00" and "12:00 - 2:00", with the ":00" possibly omitted if everything starts on the hour.