Why does the author use ‘longer’ but not ‘long’ here?
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can you please edit to replace the image with typed text. It will make searching for your question easier. – James K Apr 23 '18 at 6:01
Example #4 is explaining what prepositions are used in relation to short periods of time, such as a single day or the weekend period (often Saturday and Sunday).
Example #5 is explaining the use of the preposition "in" when referencing longer periods of time (periods longer than those identified in Example #4).
The author could have simply used "long," but chose instead to continue with the context started in Example #4.
