Well it's better than nothing I guess. Try a workout like this...
squat/deadlift(alternate each week)
stiff-legged deadlifts/lunges(alternate each week)
flat BB benchpress
bent over BB rows
Perform 3-4 sets of 4-6 reps for each exersice. This is as about as basic as you can get, but with a routine like this you are doing multi-joint movements that will allow you to gain strength and take advantage of the time you devote to lifting.