Quants Beware ! Next 390 Mio Usd Desaster ?

when computing stdev, like 25 devs or 7 devs or whatever, is there a standard period used (like 7 days, 20 days)?
 
Quote from ASusilovic:
I just observed VIX climbing 12 % today...that´s why I am asking...
Great, more risk free $$$ for me writing naked ES puts.
 
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