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by DougBTX 2301 days ago
I'm a native English speaker, I don't think I would ever say "two times bigger", sounds like bad grammar. I would read "2x the size" as "twice the size" or "two times the size", but not "add on twice the size".

So I agree with the article, "3.5 times faster (1 hour vs. 3.5 hours)" is perfectly correct, and it is OK to abbreviate "3.5 times" as "3.5x".