If you did not drive (or even if you did) you could probably get away with emptying out the coolant over-flow and fill with water/coolant rather than have the entire system flushed. I've made this mistake as well, and I was fine after I cleared out the over-flow.
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Chris 
Current: 2014 WRX Stage I + SPT / 2013 Hayabusa 202HP
Former:09 370Z 7-AT PW/Ark Type 2 exhaust/Evo R lip/TSW Nurburgring carbon
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