The ornamental design for a lap-length translucent bib, as shown and described.
FIG. 1 is a front elevation view of a lap-length translucent bib showing our new design, the opposite side being a mirror image of the shown;
FIG. 2 is a right side elevation view thereof, the opposite side being a mirror image of the shown;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is an isometric view thereof; and,
FIG. 6 is an in-use isometric view thereof.
The broken lines in FIGS. 5 and 6 of the drawings depict a dispenser and a wearer, respectively, as environmental subject matter only and form no part of the claimed design.