This happens to many small business sites.<p>If they leave their WordPress un-patched, or have a crappy plugin installed with security holes, or their FTP info is guessed, etc, hackers drop some malicious Javascript on their sites, and the next thing you know, their site cannot be accessed in Chrome, and usually Firefox as well. Depending on what services pick-up on the bad javascript.<p>For me, it usually takes a day(ish) from the time we are notified of the issue, update the sites, remove the malware, install webmaster tools from Google, submit and wait for the review to be unblocked.<p>On one hand, this is very frustrating, but on the other hand, many small businesses would have no idea their site had been hacked without it being blocked.<p>The only thing I'd like to see personally is if Google were somehow able to notify the domain registrant of the block via email so they find out right away, and not after a few weeks (or longer) in some cases. Some small business owners don't check their sites very often. We like to monitor our client sites, but sometimes new clients come to us with these problems and have no idea how long they've been down.