50 Feet works fine as long as you plan on keeping the keg cool - like 50 degrees or less. If you want to avoid icing the keg completely, you need to use 120 feet of coil but you should keep the keg out of the sun and off the ground (to keep any heat from the ground from warming the keg). If you're not keeping the keg cold, you should plan in using it up within 48 hours.
You need a CO2 system with both a coil and a plate. The coil works much better than a plate, especially if your pouring lots of beer.
I made my own jockey box with 120 feet of stainless coil and it works great. I don't have to keep the keg cold but I do try to keep it cool with a bag or two of ice. The main issue with JB's is that you need to mess with CO2 pressures as the beer gets warmer in the keg and based on how much coil you're using. I run any where from 25 to 40 PSI and constantly check and adjust to avoid foaming.
All the beer drinkers at the many events I have used it love how the beer pours and how cold it is.
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