Probably around 50mins, cos it's not exactly thriving down here (travelled from Teesside to just through the tunnel).
Was for Lily Delphine a few years ago, and frankly wasn't worth it.
I think at the end of the day, it's whether the lass is someone your really wanting to see. Plus that you have the time to spare.
Should your booking go ahead etc, I hope it turns out to be worth the time & devotion.