User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-75.85.96.231-20150707041306/@comment-24502975-20150711201917

The amount of time between v19's release and its translation is irrelevant to how long it'll take. Code-Zero was the sole translator at the time and was also still on volume 18. Once zx took over translations became a lot faster.

I'd say at a normal pace, translation of a single volume should take a couple months. That's once the Chinese raws are available.