With a little planning and discipline, it's possible to get unreal amounts of work completed in a very short time.

By getting serious about my schedule and free time, I've been able to trim my work weeks down to about 25 hours, while still producing more than I used to get done in a 50–70-hour week.

I wrote an article on how I approach this:
http://lengstorf.com/scheduling-maximum-productivity/

The bullet points are:

1. Don't work when you're not working. Turn off notifications on your phone, don't check email at dinner, etc.

2. Group tasks into context-specific work. Keeping a flow state is critical for high-impact work.

3. Insert breaks to keep you focused and fresh. Having a time limit and a short recharge is not optional if you want to remain productive for longer than a few hours at a time.

4. Plan. Without taking time to plan, all the good habits in the world don't do much good.

I coach several entrepreneurs on exactly this sort of time management and productivity enhancement, and I'd be happy to help you with a specific plan to suit your routine. Schedule a 15-minute call with me and we'll make sure both your business and your children get plenty of your time and attention.

Good luck!