Fatal error: Maximum execution time…

I am sure this was talked about in other parts of the support forums, and I would like to apologize for adding another topic, but I am in need of immediate help and advice. I updated my business website to 3.3.2 not too long ago and I have been experiencing the following error message:

Fatal error: Maximum execution time of 30 seconds exceeded….

The message sites different directories within the wp folder, but it’s never the same one. What should I do? What do you think is causing it? Any advice/help would greatly be appreciated!