To Brighton. They have timetables on the internet you know.
I think it'll be easier and nicer to walk to Hastings than Ore... which i think is similar to Southwick Station. The 10.15 from Hastings is the fast service (from Ashford) that doesn't stop much, and takes about 1 hour to get back to Brighton. That train doesn't stop at Ore.
So i reckon, leave on the final whistle, get a move on down to Hastings station (passing some shops to pick up some tinnies etc) in time to catch the 10.15 express.