What kind of Chicken is it?
I showed Cochins and even Bantams take about 2 hours from start to finish.
If it is white you can get blueing to add to the rinse water to really brighten it. I used baby shampoo, then rinsed, added some fabric softener to my rinse water.My final rinse was with the blueing added. Make the water slightly warm as if you were bathing a dog and generally they do not mind it at all.
When done washing, wrap in a towel for a bit, then get the hair dryer, start on low and start drying, you can fluff with your fingers as you dry, and make sure the feathers are laying properly.
I just bathed in my bathroom, but you can also set up totes, one for wash, one for rinse, just make sure it is warm and draft free wherever you are.
You can use baby oil to enhance the cobs, wattles and legs when showing. A small nailbrush works well on feet and legs.