If you don't know how to do this, I strongly advise to get in touch with someone who does. The question you ask (no offense intended) implies you do not know your way around in EV. You risk of deleting more than allowed (or less). You might also 'break' something else...
It should not take more than a day, but it will bemoney well spend.
for reference future, use google to calcualte number of days from present day to date of expiry. set retention categories and run but dont NOT leave. change each day by 1 day and then disable or change retention when finsihed with all. use archive protect settings on advanced tab to limit archives at time if need