How to decal 15 slogan in the least time?

Only by arranging the slogan 15 in five lines and three columns or three lines and five columns can the decal time be minimized.

1, assuming that the side length of the slogan is all 1, when there are 1 rows 15 columns, the perimeter of the slogan is all 32 >, and the perimeter is: 16,32 >:16, so/kloc will be