How long before buffing euro clear?

I used Euro 2020 on a 2013 KIA which was black. I used hardener in the black base with two coats of clear with 870 reducer, and a splash of polar acceleator. It has been a bit colder here, but I left the car inside for two days, than buffed. You can see in my rear bumper cover some hazing, so i guess I didn't get it buffed enough. I looked great inside and good outside, util the u shifted. My main question is the customer took the car, and will bring it back to buff the rear bumper cover again. We are out of the higher temps here in Montana (highest maybe in the mid 50's. How long would I have before I really need to buff this out before it gets rock hard to buff? Weeks? Longer since it's cold outside? Low's in the 20's and high's now in the 50's. I seen some says they have waited weeks or longer with Euro, and it still buffed fine. Thanks for any advice, guys!
 
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