Ignoring the fact that “five minutes” was probably just hyperbole, you can absolutely get what you came for in five minutes. Five minutes is long enough for me to validate an idea from “wouldn’t it be cool to do X?” to “man I really don’t want to do X”. And I’ve just gotten what I came for, validating (or invalidating) an idea.

Just because you have an idea doesn’t mean it’s worth pursuing that idea, especially if it turns out you’re not interested in that idea after all.