For bigger gigs I like to use them all but I can get away with using just the Nord and the Kawai by switching out the synth lines for hammond "pad" works. I can get all set up and sounding in about 10 to 15 min on a good day excluding load in. The wiring does not take long as all cables have their place and just need to be plugged in. Load in will also be shorter when I get to building a big trunk which holds all boards and stands