Term needed at end of "an operation period"?

asked 2017-10-08 11:11:18 -0400

Amahl gravatar image

Given the phrase "...an operation period" and the phrase "from May to June," I maintain that some word is needed between the two when they are combined: "...an operating period [SOMETHING] from May to June." CMOS editors and everyone else I've asked disagrees with me, but I am quite sure I am right, at least according to the rules I grew up with. "Of" is the simplest choice ("...an operating period of from May to June") but it sounds bad. "Lasting" would work. Could you tell me if I am right that something is needed, and explain why (or why not)? Thanks!

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