The line for sushi is getting longer with/at each passing second.
2. Also, which one is correct? (each passing second) and (each second passing?
The line for sushi is getting longer with each passing second. It means that people are queuing at the rate of at least 1 per second. At the end of 10 minutes, there will be at least 500 more people in the sushi line.
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The line for sushi is getting longer with each passing second.
It means that people are queuing at the rate of at least 1 per second. At the end of 10 minutes, there will be at least 500 more people in the sushi line.
habibaelgindywith/at each passing second
I always use "with every passing second" (but "each" is also OK).
According to Google's Ngrams, both were used with about equal frequency until the 1970s, when "each" gained a great deal more popularity, so nowadays "each" is more often seen than "every".