Yep, sounds reasonable, but like I said, over the years it seems to depend on who you ask. Barrel length seems to play a big role in how long guns were historically categorized in the history of the carbine as a shortened rifle.In a levergun, it depends solely on the features present. A short forend with band, banded magazine, carbine style buttplate and round barrel make it a carbine. A butt cap, crescent buttplate and round, octagon or half round with a dovetail magazine hanger make it a rifle. Barrel length is way down on the list. You can have a short rifle with a shorter barrel than a carbine.
Anyway, interesting to note that Winchester's current catalog lists their 1892 carbine as having a 20" barrel.
https://www.winchesterguns.com/products/rifles/model-1892/model-1892-carbine.html