Doing it now. Continuing to work full time, wife works. Doing it online through a brick and mortar university. Not Phoenix or the like.
Except for the "doing it now."
I went back at 28 to finish my bachelor's degree. I had to finish 30 hours. I scheduled everything I could 100% online, 50% online or at night. Sometimes I would take one class a semester, some times I would take two. Whatever I could. When I got down to my final twelve hours, I had to schedule two classes during the day (and one online, and one at night). I bit the bullet, talked to my boss (I was a marketing director at the time), and offered to work extra hours to make up time on the ten weeks it would take me to finish. I agreed to be "available" for emails during class and calls if absolutely necessary.
Two years later, I got my MBA (online through a brick and mortar). The program was designed to be completed in 24-36 months.... I did it in 15.
You have to be willing to put school first for as long as it takes to get it done, but it can be done.