Suggestions for a Peach Pale Ale

Afternoon,

wanted to enter a peach pale ale into a local beer comp down here in south carolina. I'd like to use some local produce, and add it to the secondary. It's a full grain batch, and I already have it sitting in the fermenter bubbling away. I was going to rack it to the secondary in about a week.
I dont want an over-powering peach taste/smell like Son of a Peach. Just a light nose to go with the simcoe I tossed in at the end of the boil, and a little bit of flavor to add to the light bodied pale ale.
Need suggestions on:

how much to add to the secondary, and for how long.

thanks in advance!

Use this for reference...while its extract you should be able to calculate how much peach you need to equate for 4 oz of peach concentrate

http://www.northernbrewer.com/documentation/allgrain/AG-PeachofResistance.pdf