Processional Song Timings

Hi all, we are choosing my ceremony music at the moment and I really want Songbird by Fleetwood Mac for my processional as they are my favourite band. I could do with some advice though from anyone else that has used it as as their processional. We have a short aisle (approx 20 feet) in a hotel setting and I have two pageboys, 2 bridesmaids and my matron of honour going down before me in that order. Can anyone suggest when the bridal party should commence their walk and when would I need to commence my walk down the aisle. I have listened to it so many times and just dont know what the timings should be. Many thanks for any advice.