Help Needed !!!!!!!

I am currently having problems with my custom menus. They were working fine until a couple of days ago but now each time I try to build a page I get the message ..Fatal error: Maximum execution time of 30 seconds exceeded in /home/tht8/public_html/thtandlcab-football.com/wp-includes/formatting.php on line 83

Can anyone help as I cannot add any new pages until this is resolved.

I am also now having problems logging in ?!!

Thanks for the help !