I am having problems with my K models when the sodium profile turns off, goes from 145 to 139, my conductivity stays high. I am fairly new to with the K models and I know their proportion system is slower than the 1550's, but how long is a reasonable time to expect the conductivity to adjust itself?

It should level out in no longer than a few minutes. Dunno why it would be any longer than that?

Adjust your dialysate limits to whatever you
conductivity is for that day. This will set
your HLIM accordingly.