Time To Clear My Inbox

Can you beat it that I have over 5,000 emails in my inbox? I always tell myself I must delete all the emails that I don’t need to refer to anymore but I keep procrastinating. I had kept all those emails including some holiday invitations emails thinking that I will refer to them in future but I never refer to them. I MUST spend at several hours to delete all these emails from my inbox before it becomes full.