You'll probably need to run 20-25 PSI on the co2. That pressure is determined more by the resistance of the coil rather than the temp of the beer.
As far as under/over carbonation, you'll be fine over a two day period. Just release the pressure off the keg overnight down to 12-14 PSI and raise it back up when you need to pour.
Can't tell you what the diameter or length of the jumper hose is since I just lent my jockey box out. It's about 4' long and maybe 1/2" ID.
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