Should I say "It's been a long-term dream of mine to do sth" or "It's been a lifelong dream of mine to do sth"
closed as off-topic by Julie Carter, Chenmunka, FumbleFingers, Edwin Ashworth, tchrist♦ Aug 22 '15 at 13:55
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Long-term or short-term is rather associated with goals, plans, objectives etc. and not with dreams. For dreams the word 'lifelong' is much more suitable. Hence you should choose
It's been a lifelong dream of mine to do...
You could refer to this n-gram from Google which compares occurrences of 'long-term goal', 'long-term dream', and 'lifelong dream'.