I've used a 33" long shooting board for about 15 years but on a number of occasions recently I've found it a bit short. So with a hour or so to spare I made myself a new longer one.
It's 48" long x 11" wide and made from 3/4" multi ply.
When I'm planning long grain I use the sole of the plane to achieve a straight edge, rather than rely on the board as you would with end grain. I hollow the middle and then take through strokes until a get a full shaving, thank you David Charlesworth.
I lined the runway with self adhesive UHMW tape which gives a durable and very slick surface.
Below is my collection of shooting boards, all very useful. An end grain board with a 'trap' for my Veritas shooting board plane which gives me a perfect 90 degrees. A 45 degree mitre plane as per Bob Wearing's book and my new extra long board.