Andrew's 3 more weeks in primary would be good advise for most any other beer, but Hefes are better pretty young, and don't need much conditioning/aging.
For my Hefeweizens, I do two weeks primary then straight to the keg for two weeks to force carb at serving pressure, then I DRINK! Lots of peeps will even keg right after FG is achived, force carb at higher PSI, and enjoy their Hefe TEN days grain to glass.
For this particular style, as soon as you hit your expect FG, you are good to move on to kegging/bottling.