LULL: four cells and one turn
Trace LULL from L at row 6, column 1. Go down to U at row 7, column 1, then right to L at row 7, column 2 and right again to L at row 7, column 3. Count four cells, including both consecutive final Ls.
The U is the turning point: one downward move leads into two rightward moves. All four cells touch the board's edge, and one is a corner. This first route accounts for four of the 40 open cells, leaving 36 for the five remaining entries.