Well actually, not recess time, FR is my planning period. Which I feel is just as valuable as my daughter's 1st grade teacher putting in her Scholastic order while the children worked!
I can type while they do sums or read. Sometimes they read along with me. They just have the freedom to get the work done and move on to something else instead of waiting for the others to catch up. That was what school was for them.
I also FReep during class time. As a homeschool mom with a class of two, it doesn't take me every second of the 4 to 5 hours we spend on academics each day to teach. I'm a facilitator more than a lecturer. Both my kids are independent learners and self-starters.
My time is spent assigning work, helping them organize, clarifying directions, checking their work, etc. They both work on their own and when they need me, they know where I am. In between those times I FReep, clean house, do laundry, start dinner, pay bills, answer email, etc., all things I can do in small time increments while they work. Judging from their test scores and that fact that they both work above grade level, I'd say we're doing something right.
BTW, we use Singapore Math--I highly recommend it.