How Many Reps of Deadlifts Should I Do When I Workout? (Ignore that guy's mention of lifting belts- he's in another league of lifting.)
5X5 is one standard, but it depends on your goals same as everything else in life. Just one set of 5X5/wk is better than nothing but will not be enough to become a powerful lifter.
Because my goal is to maximize general fitness, endurance, and energy, and to minimize deterioration rather than to become a serious powerlifter, I alternate every couple of weeks between 5X5 heavy, and 8-rep pyramids of, say, 6X8. I also throw in one set of rack lifts/wk to work on my sticking point with my max lifts. Why not? It's just more mental and physical challenge. It builds character and sex appeal.
Remember that when we discuss weight training we mean to integrate it into the Maggie's Fitness for Life program which means approximately 2 days calisthenics, 2 days weight training, and 2 days of cardio with lots of HIIT. Around 6-7 hrs/wk, not including sports and recreation. Also, appropriate nutrition for fitness of course.
No promise you'll live longer, but guarantee you'll live better and look better.