I am actually working on a scolar presentation about Careto malware. I was really impressed by the time it took to discover it (at least 6 years, according to some compilation stamps), so to improve my presentation I am looking for statistics about the average time before a malware gets detected (i.e. the time between its creation/diffusion and its discovery by someone), to compare Careto to the average malware.
I have searched on Google but couldn't find anything interesting (because "the time to detect a malware" can also be interpreted as "the time to detect a malware on your computer").