New target porting time estimates?

[Richard Tierney]

Hi - can anyone give me any opinions on how long it'll take to port GCC 
and binutils to a new architecture? This is a medium-complexity RISC-ish 
processor. I know this is a 'how long is a piece of string' question, 
but any estimates would be much appreciated. I've spent a couple of 
hours on the web looking for answers but had no luck.

Many thanks

Richard