My RT is 30X52 & the router is about 12" from the end (52" dimension) and a bit to the left of center (if standing at the end). As BJ says, you need more infeed than outfeed. Having it near the end does several things for me: (1) I will install drawers under the other end, (2) it's a comfortable distance from the edge when holding the wood in my hands, (3) it supports the long feed of my Incra fence and (4) when free-routing long pieces I can remove the fence and rotate the stock lengthwise on the top.
This top is only a few months old but the one that eventually replaces it will be larger, if anything.
Check out that new high-tech cordless router.. wireless and no recharging required!!