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Apr 29, 2017 at 0:04 vote accept GoingMyWay
Apr 28, 2017 at 21:10 comment added alephzero ... except that "hang on to" is not formal writing! Something like "how long can I keep/use/retain them" would be a better formal version - and doesn't need "for" at all.
Apr 28, 2017 at 15:18 history answered StoneyB on hiatus CC BY-SA 3.0