"I studied for about 2 or 3 years." is natural while "I studied for about 3 or 2 years." is not. Notice that the time period length sequencing is from shortest to longest.
Yet, in this audio clip at www.bbc.com the sequencing is longest to shortest How Japanese Police Confront Violence at the 20-second mark you can hear in the background the officer say
(1) it is natural to list lengths of time in reverse numerical order?
(2) ALSO, notice that he just said "一年" instead of "一年間" which contradicts my understanding.
I definitely would have said:
and this is definitely unnatural, correct? Both cannot sound natural?
What about "２、３本ぐらい飲んだ" vs. "３、２本ぐらい飲んだ"? Which is better?