As usual - the key to answering this question depends not on the size of the pan but on the size of your portion & how full the tray is0.
We use 1/2 trays at the Hut filled about 3/4 & usually get around 10 - 12 small servings served in 8oz deli containers. Not precisely 8oz each but pretty damn close.
Cha Cha Hut BBQ : 43311 Route 28 (corner of Route 28 & County Road 38: Arkville, NY : [URL="http://chachahut.com"]chachahut.com[/URL]
Backwoods Pro Jr.
busted Backwoods Fatboy
Weber 22.5 Kettle
some stainless wood fired thing