Is there any way to unzip more than one file at a time, becuase the only way I know is to right click on the file and click extract all, this can take a lot of time if there are several files to unzip.

You mean all the files in one zip folder? Just go to actions/select all then extract. This will extract all the files in the zip to your specified location.

No, I mean several different folders containing different files

You can try the free trial of WinZip:

http://www.winzip.com/

I also use this free utility:

http://www.ultimatezip.com/index.htm

I am not sure that these will do what you want but they are probably your best bet.