Seriously. just hack the timeout out of the OS. I bet I could do it in a single day. The FBI is playing at something bigger here - they want to set a dangerous precedent. The battle is not about access to that particular phone (unless they are truly incompetent - which can't be ruled out, unfortunately.)
How would you do this, exactly? As far as I know, you'd have to find an unpatched exploit you can use over USB. That seems like something that would take longer than a day, unless you're amazingly good at this stuff.