Recovery times?

This year, at last, I am doing some regular strength training exercises as part of my exercise plan. I strength train 2/3 times a week, spending between 45-80 minutes each session. I am currently doing 8-12 reps each set and 3 set of each exercise.

Here goes my question: I want to spend less time for weights so in the recovery time of one exercise, I do some other exercise which was not used in the former exercise. Example: chest press, leg press.

What do you think of it? Am I cutting the recovery times too much to make both exercises inefficient or is it okay?