Why girls take so long to get ready

I am pretty sure that the average guy has had his time waiting for a girl to get ready, whether it's a mother, sister or girlfriend. Yes I hear you, its irritating and frustrating and sometimes results in an argument or being late. Why, you ask, do girls take so long to get ready? Well let me break it down for you in the simplest and most polite way.

My shopping problem

Hi my name is Sarah and I'm a shopaholic.

What started off as an acceptable interest in shopping has slowly become what feels like a full blown addiction. I need to be stopped!  I'm obviously past the denial stage in this situation and onto the 'how do I cure this' stage. I know every girl loves beautiful things, but where do we draw the line? When is enough really enough?