After being away over a month, I am happy to be back in the US.
This sentence caught my attention and so I am going to toss my two cents into the mix.
”It would have been nice meeting you at ATIA 2004 Conference” This is not a complete thought in my opinion. The blue part immediately offers a conditional scenario which is to be followed by an “if” clause.
It was nice meeting you at the ATIA 2004 Conference- This is fine
The vacation would have been perfect if we could stay for a few more days. - ok
My thought: "AT" is the right prep. but not for the reason of being temporary although phrases like "at the moment", "at the movie" and "at the bank" etc do offer this suggestion.
I am living at home now to spend more time with my parents. - This offers a rather ong and lengthy duration.