I have a chiller that has 60 Ft of half inch copper. That allows for a lot of water volume to go through the chiller, and also provides a lot of surface area. With my setup I can chill five gallons of beer down to pitching temps in about 5 minutes. Others will have different results using the same chiller because their water temp is different. However, reading the forums, if you can chill in 15 minutes or less, you are in great shape.
As far as connections to the chiller goes, I brew outside or in the garage. So I use a garden hose hooked up to the spigot to supply water to my chiller. I also bought several quick disconnects for garden hoses at Home Depot, and I put them on all the items that get attached to the garden hose (like a water filter). This allows me to very quickly attach any needed item to the garden hose, or quickly detach it when I need the hose somewhere else. I also bought a small ball valve that fits on the garden hose (I leave it there all the time) which allows me to turn off, turn on, or control the flow from the garden hose to the water filter, chiller, kettles for cleaning, etc. I find that this setup works great and saves me a lot of time.
Best of luck on the new chiller. Mark