I never consciously say OK, I'm going to practice for an hour and a half today or whatever I just play what I think needs work until I'm happy with what I've done, I do think you can especially as a beginner over do it and quickly get fed up, seen some members on here recently full of it one minute, buy loads of saxophones then they either give up or you never hear from them again the next. It's a long hard road with very little short cuts I'm afraid. I Must admit I always found the Jamey Aebersold books over complicated and very hard work, I have a few of them but just couldn't get on with them to be honest.
Some stuff I do like doing is running up and down scales with ever increasing speed, really improves dexterity as well as breathing I reckon, also with stuff like G major and above rather than run up to a 12th go into the next register, then back down again.