Yes the key is to prepare as much stuff as you can in mass quantities. It takes me about 15-20mins to put together my meals for the day at work as well as breakfast. Then every other day while I'm cooking my supper I prepare all the "bulk" items.
So for me it's like 20mins in the morning and 30 min at supper and maybe 45min - 1 hr at supper every other day. I probably spend less time cooking than a lot of ppl that eat much much less than I do just because I am efficient about it and have very simplified meal plans.