"This might take a few days... it's a big change."
"Well... I'll take a look at it, but if it's going to be *days* I don't think I have time."
...try a month. To do a *bad* job. 1000 files worth of source code automatically 3-way merged using a script, then hand-tweaked until it compiles. How the heck do you code review that?
So, um, yeah, someone else can figure that out, I've got other things to do this month. x.x