You are your voice's "Personal Trainer!" And you want to get it in great shape and keep it there. Working out daily with your voice exercises is how that's done! Yes, you're busy but so is your voice! Busy impressing those you daily interact with, at work, home, church, school, etc., and it needs your "personal training" to be beautiful which is easy to do if you're really determined to get & keep control of it, and experience its full beauty... in any situation and on stage!
You are your voice's "Personal Trainer" so work it out every day before you go to work - you'll definitely see how easy this is if you do your vocal exercises...
1) while you're in the shower, 2) while you're doing your makeup or shaving 3) while you're getting dressed, 4) and finally, preparing whatever kind of breakfast you eat!
All of this adds up to 45-55 min. a day! Mon.-Fri. You'll see wonderful results in just 1 week! And then, you'll always keep it in shape because it'll "bless your heart"!!!