I think it is correct to say "restocking" in here. Why is "restock" used instead?
"Restock" is being used as a noun here, which is why the speaker says "so that we waste less time on restock." Technically, "restocking" can also be used as a gerund (a verb functioning as a noun) to create "so that we waste less time on restocking." There is no significant difference between the two phrases, and "restocking" can be used without changing the sentence meaning. Ex: I like to bike in my free time. Ex: Biking is one of my favorite pastimes.
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