途中に/途中で・とちゅうに/とちゅうで - Grammar Discussion

on the way
partway
in the middle of

Structure

  • Verb[ ] + 途中に/途中で
  • Noun・の + 途中に/途中で

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Hi, I’m having trouble learning when to use に and when to use で with 途中. It says that に usually emphasizes the duration while で implies that A was sort of an opportunity to do B, right? Yet while reviewing, the sentence 出張の???実家に寄ってもいいと言われた。popped up and 途中に was the excepted answer. How is the duration of the trip relevant in this phrase? and isn’t the trip typically an opportunity to visit family? I don’t understand.