What is the difference between trip and journey? [duplicate]

I have read the following example online:

The journey there took three hours. (correct)
(A) The trip took three hours (wrong)

All dictionaries defined a trip as a short distance travel while journey it takes a lot time to achieve, i.e. to travel for a distant area by a vehicle. This already is understood and no question to ask more but I had this example:

(B) We went on a three-week trip to Scotland.

Now my question is:
Why do they limit the use of the term (trip) to be for a short-time travel as in A sentence, then it is for three-week tip to _______ as in B?

Here apparently confusion will occur not only to a non-native speaker but to the native speaker as well. I wonder how this duality in English language! I fear and wary off! This is a mistake, the very error to deal with

"A trip to Scotland lasts three weeks" is (correct) but to say:
"The trip took three hours" (wrong)!

Another question:
Does the trip in the sentence

We went in three-week trip to Scotland

mean going and returning home?

Solution 1:

In this usage a 'trip' isn't a 'short journey', but an excursion. While the OED gives Trip (The link is only available if you have and OED Log-in. Members of most British Public Libraries should be able to log in if they have a Library Card number.)

b. A short journey or run on land; esp. each of a series of journeys or runs over a particular route.

it also gives

A short journey (by sea or land) for pleasure or health, an excursion (more fully pleasure trip); in later use often applied to such a journey whatever its length. Also applied to a passage by rail provided at a fare lower than the usual; a cheap trip, an excursion; occas. short for ‘party of trippers’ or ‘trip-train’.

So a trip can be a short journey,

a quick trip to the shop

or is can be a long one

a round-the-world trip

Solution 2:

It's not really the distance or the length of time that is important here.

Note that trip, in the sense being referred to here, is only a noun. Whereas journey may be either a noun or a verb.

This is not an accident. In essence, a "trip" is an incident, whereas a "journey" is a process, and the implication is that this process is significant.

If you say you "took a trip to the top of Mount Everest" then you're implying that you magically got there and back, and how you got there was not that important -- you might have been asleep the whole way. But if you "journeyed to the top of Mount Everest" you are making it clear that the process of getting there was an experience (that you were awake for), and likely there are some stories you could tell.