From experience there is more than enough work for the legs in the Reeves Classic, plus remember one of the first additions to that routine is to add some SLDL on one of the days each week as well.
So as hammies get hit in the SLDL, squat and Regular deadlift and quads get hit in the squat and regualr deadlift, including ramping weights thats the hammies getting hit directly 6 times per week (SLDL and DL) and indirectly 9 times per week (squats) and the quads getting hit 12 times directly (squats and DL)... a total of 27 sets for the legs !!!
Try not to think of a fullbody routine as each muscle getting worked x number of times, there is more to it than that, they are written with an overall amount of work for the whole body as the goal, and trust me, if done at the proper intensity will give great overall growth the the body.
hope this helps