Using just one bar, and as much weight as you can, squat for 8-10 reps. You’re going to set a countdown timer and work your way through the following lower body ‘complex' as many times as possible ...
My leg days are usually an hour and 20 minutes, and my upper body days last an hour. I also do 20 minutes of cardio after every strength training workout. Weekends are my active recovery days.