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Does a rebuilt engine run warm until the break in is finished?

The major factors for heat transfer are the amount of masses to be involved in the transfer, both of the water flow and the airflow, AND the temperature difference between the two, not time. There are of course others less critical like the ability of the coolant to transfer heat, etc.

Excessive water flow concerns only enter the picture when water flows fast enough over/around internal obstructions than it can cavitate even with the normal cap induced static pressure in the system creating hot spots that are difficult to detect, ie likely very rare.
 
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