I need to "rip" some 3" high baseboard down by about 1/4". This is
your basic home-center baseboard.

I don't have a portable table saw, but I do have a router table with 2
fences. I figure I can run the baseboard along a straight bit and
remove the ~1/4".

The questions:

Can I remove a 1/4" in one pass or should I plan on two?

What size bit should I use?

Any other tips? (I'll use feather boards, etc.)

Note: I don't believe that quarter-round will be installed, so I need
a good finished "cut". I'm traveling 300 miles to dad's house to do
some chores, so I want to be prepared to knock this one off fairly
quickly.

Thanks!