I'm still fairly new to this but the best way for me is to use them the same day. If there are items that are producing RR's then I write up my list breaking it into 2 transactions. The first transaction I buy everything that produces a RR. Then I turn around and buy everything else using my RR's and any additional $ if needed.
That's the only way I could do it. Otherwise, I would forget to use them and get frustrated with the whole process!
