[KyleGoetz]

Thank you, both of you. So is it safe to say that the 折 does not come after the thing that is a good opportunity, but it's more coming after some event, and is followed by the thing that should be done at that event's time?

So basically 折 functions just like 時, right? Is there any difference? The book talks about one being あるいい機会, but then I can't figure out how that fits in with sentence 2: 先月北海道に行った折、偶然昔の友達に会った。 because this was not an event where a person did something on purpose. It was an accidental meeting.

I'm probably just really confusing myself. Let me restate my problem:

Here is what I understand:
折 is similar to 時

Here is what I don't understand:
How is 折 different from 時?

Thank you both.