How much is too much?

As the year is progressing I find my motto of being stress free is becoming harder and harder to adhere to. One thing that is making my motto difficult is the communication piece of my classroom. I feel most of my day is spent returning emails, making phone calls or having one-on-one meetings before or after school and typing newsletters.
I have tried to set specific times in my day to return phone calls and have started making more phone calls instead of emails because I feel it is faster to just call. This worked until I spent over an hour after school one day emailing and returning calls and I couldn’t do anything afterwards because I was mentally drained.
I have also tried to break up that time slot. I try and limit phone calling and emailing to 20 minutes, 3 times a day. This has seemed to work. I have managed my time more by dispersing it throughout my day. But then I began to think… that is A LOT of time to be communicating with parents every day. I feel communication is the key to successful classroom management, but when does it become overbearing and interfere with teaching? I encourage all of my parents to be as active as they can in their child’s education, but when does all the parent communication become too much?
There have been many studies on the importance of parent involvement and how it links to student success. The National Center for Student Engagement has an interesting article on the barriers of parental involvement. The list of barriers is a great tool to use in your classroom to evaluate why some parents may not be as involved as you would like. Joyce Epstein has also included a framework for parental involvement. Communication on a regular, two-way basis is number 2 on the list.
Another article I found very informational is an article from the Child Trends DataBank. It states children who have parental involvement are less likely to have behavior problems, have better academic performance and are more likely to complete secondary school. Although it does state the differences in success in areas such as grade level, ethnicity, parental education, poverty level, and parent language.
How do I successfully involve my parents but yet manage to complete everything else in my classroom in a timely fashion? How do I get those few parents involved whose child needs their involvement the most? What do I say to the parent who wants daily updates and won’t take “I’ll try my hardest” as an answer? Is this a problem I should take with a grain of salt and be happy I have parents who are so concerned? Or is this a problem that needs to be addressed and fixed soon?