I know there are some here that know, they probably just haven't been on yet. I also know this has been covered before and can be found by going up and using the 'Search' function.
I did try and search for the experience hours required for CP-189 but nothing came up. There was a lot of great info that compared SNT-TC-1A to CP-189 but no info for required hours. I googled it and someone said it was the same as NAS-410 but I couldn't find any other reference.
It sounds like I might not even worry about it because CP-189 may not be around much longer.