Closer to 2 weeks, as long as the new model fits: your model bits are entirely in mask rom, so you can change them with a metal only ECO that only touches two m

Closer to 2 weeks, as long as the new model fits: your model bits are entirely in mask rom, so you can change them with a metal only ECO that only touches two metal layers. You probably don't even need to run any timing analysis, etc. since all of the changes are going to be isolated in a gigantic square that's isolated from everything else.