this trait is gained after i use poition of regression, and i have question - will this trait wear of over time, or it is needed to use services of slavers guild ?

It does not wear off. You need the slaver's guild. On the other hand, if one of your slave has the Trainer specialization, the will eventually remove the Uncivilized trait from other slaves.

how long it usealy takes for tamer to remove uncivilized trait ? And using of regresion poition is very expensive - together with using slavers guild for cure, it have one very positive effect, and that is pliable trait, which gives you random? trait with +25 to some stats...and thats not bad..especialy if you in that trait are over 75, so every point over this and you will get number over 100, normaly unreachable. and i hope this "overflow" is not bug, and they will keep it.

I normally get rid of "uncivilized" by assigning Tamers (more than one if possible) and wilders to the same occupation, finishing the day and then reloading and reloading and... you get the idea. (There is also a lovely mechanic that wild slaves can be trained as tamers too and eventually "tame" themselves))))

That's why I never felt that degenerating slaves mentally is worth it.

well, if you cant train uncivilized person as tame,r then it is surely bug/oversight....because, well, before you posted it, this idea never stiked me, and most likely to programator too.