FIG. 1 is a top view of an adjustable timer housing showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a rear view thereof.

The broken lines shown in FIGS. 1 through 5 are for illustrative purposes only and do not form part of the claimed design.