A patch comes out and they were exploiting it in mass a week later. The quickest turnaround I have seen is a week.
The cyber criminals are always targeting patched vulnerabilities (at least 99.999% of time). Which are you being dumb and installing it, malicious adds, infected website’s, and emails with malicious attachments. It is better to block the paths they use to get on.
The serious crimeware they have now changes itself every couple of days. You could install Mcafee, Kasphersky, or AVG, but the truth is though unless it is old malware it isn’t going to find it and even then it is much less than 100%. Don’t crick on shady shit or install shady shit. Don’t install pirated software these days. Use Chrome or Firefox with Adblock of some sort Adblock Chrome Extension, AdMucher, my fav but only HTTP) or AdGuard - what I use but paid. Don’t install flash or java if you can avoid it. Here is some advice from a friend of mine who is the security expert for the highest level government officials: Even Symantec (yes, Norton Anti-Virus™ People, the world’s biggest IT security company) says it's dead. Google says it's worthless, Firefox's former developer says it's ' terrible and should uninstall it immediately'. You really don't need it anymore if you are smart.