Use the first sentence. "Jiffy" means "very quickly". An instant is a very, very short period.
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successorHello,Both are correct in my opinion. Firstly, both jiffy and instant can be
I would like to know whether both of the following sentences are correct. Thank you for your answers!
1. The shoe repairer is so quick he can fix the shoes in a jiffy.
2. The shoe repairer is so quick he can fix the shoes in an instant.