It would be "a ten-times return". While that would be acceptable in many everyday contexts, "a tenfold return" seems better in careful English.
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IvanhrI can't, however, categorically dismiss 'a ten-time' as incorrect.For me, "a ten-time ~" seems to mean that something happened ten times, e.g. "a ten-time champion". However, actual usage may be fuzzy.
MustAskIs it "a ten time or times return on investment"?Sorry, but I can't accept that term at all. 'Ten-fold' or '1000%'.