A few more decades, assuming all goes well and there’s a crackdown on places like the gulf (that situation only exists because the US military umbrella protects the local royals). Mauritania is not a populous country, and in other poor countries you have to go seriously backwoods before people are able to even somewhat-openly keep slaves, so it’s not like the progress made is negligible.

And of course there’s cases where some guy (or guys) lock somebody in their basement, but if it’s ended and the offenders punished immediately upon it coming to light, I’d argue we should count that as a sort of background noise that can’t be avoided.