If CPS orders you to take parenting classes in a child abuse case, how long can the classes take to complete?

This is not a severe (or high-risk) child abuse (ca) case, but under Oklahoma law it's ca none the less. I slapped my son (5 years old) across his chest a couple of time with the back of my hand, and it left some redness and swelling. Me and the mom are married, but she was forced by CPS to have a VPO put on me for him. I also had to move out of the house, or all 4 of our kids would be taken from us. I'm currently living out of my car, but I still pay the rent, utilities and give my wife money for groceries. So if CPS does order me to take parenting classes, can i move back in the home or do I have to wait until the classes are completed?