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The Anaheim Convention Center only rents spaces in periods of 24 hours.

Hi,
Is it right and about the same to say "by the periods of 24 hours" and "by the day" instead of "in periods of 24 hours" in the above? Thanks.
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in periods of 24 hours - This is the best phrase. I interpret it to mean any consecutive 24-hour period. eg. 8 am to 8 am, or 5 pm to 5 pm.
by the day - This means usually from midnight to midnight.
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Thanks, Alphecca Stars.

By the way, is it also right to say "by the periods of 24 hours?"
AngliholicBy the way, is it also right to say "by the periods of 24 hours?"
It would be understood, but it is not the usual phrasing. "In" is used for quantities: Compare these:

It is sold in quart-sized bottles.
It is sold by the quart.

You can buy them in batches of 12.
You can buy them by the dozen.