That's of course certainly possible, if you start comparing the three JWH's I mentioned (122, 210 and 182) which are alkylnaphthalene analogues with something like JWH-018 which is different because it has no substitution on the naththalene rings.
The length of that chain can have impact on the duration, we see that for instance when we compare 2C-D, 2C-E and 2C-P. I said I didn't know what exactly the difference would be but apparently you know yourself.
But what would be the advantage of adding JWH-122 to JWH-210 if 122 has a much shorter duration and is in your opinion unextraordinary? The only thing I can think of is adding an extra boost to it in the beginning.
The length of that chain can have impact on the duration, we see that for instance when we compare 2C-D, 2C-E and 2C-P. I said I didn't know what exactly the difference would be but apparently you know yourself.
But what would be the advantage of adding JWH-122 to JWH-210 if 122 has a much shorter duration and is in your opinion unextraordinary? The only thing I can think of is adding an extra boost to it in the beginning.
of course this would only be relevant if he only had 122 in the first place and wanted to make it better. But I think you're right that it would be a waste of money, at the very least, to order both in the hopes of improving the experience when 210 is probably just as good without 122.