"Fermentation took place in an incubator at 28C for 24 hours, after which time the grains were separated from the medium with a plastic sieve and plunged in a fresh medium"
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The usage is OK @Fifi Blu. Another example: 'He usually works in the library for 5 to 7 hours, after which time he feels mentally tired and needs a break.' Of course you can substitute 'after which time' with 'after which' which is the more common way to write your sentence. I think the use of 'time' specifically gives importance to the amount of time taken in that process. – English Student Oct 24 '17 at 13:19
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Yes, it's fine. "which" has "24 hours" as antecedent, so we understand that after 24 hours (time) the grains were separated ...". I've bracketed "time" because it is not needed. – BillJ Oct 24 '17 at 13:33
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Fifi, my writing ear instructs to break the sentence to two sentences:
Fermentation took place in an incubator at 28C for 24 hours. Afterward, the grains were separated from the medium with a plastic sieve and then plunged into a fresh medium.
Glenda
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"Then the grains were separated from the medium with a plastic sieve and plunged into a fresh medium" a fine choice as well.
Glenda
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