Yes, but convincing yourself to give them more time is still within a known framework.
"They said it would be six months, and I've given them a year," is still more information about what your position should be on asking than, "They didn't know how long it'd take, and it's been a year, and that's kind of longer than I expected."
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"They said it would be six months, and I've given them a year," is still more information about what your position should be on asking than, "They didn't know how long it'd take, and it's been a year, and that's kind of longer than I expected."