I have seen this happen before and it is not acceptable. I always allow 15 minutes in between each set. That gives time for the next act to be up and running and gives peopel a chance to go for a pee or drink etc. Having an MC who controls the timing is so important. I provide a printout of the timings for each artist to see, which shows clearly what time they are on etc etc. It's not rocket science, just needs good preparation.
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