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As for your question: I have never tried anything quite like that. There is a way to install several patches at once and do only a single reboot after they all do in. I have done that. But I wouldn't try to let users use the box between patch installation and reboot. This addresses the "what is normal" part of your question.
But if you want to try, it is possible. Just leave off the "-x autoreboot=true " during swinstall.