If I could bring my dog to work, work would be much more fun.
I wonder if “fun” is an adjective or noun in the sentence. If the verb is “have” then I have no choice: a noun. But here the verb is “be”. So What do you think? Is it an adjective or a noun?
In addition to forgetting the apostrophe, I probably misremembered the quote. “At arms length” usually means a distance to be maintained, when what I meant was “within reach.”
As to @Anglophile’s “at an arms length”, he may have been thinking of the similar term about “an arm’s length transaction”.