Depending on the product(s) used a scrub can take anywhere from 3-7 minutes these days. On cases where hardware, or devices are implanted, the scrub may be longer per Drs instructions.
The ONLY people allowed in the OR unit besides those who work there, are with federal agencies (occasionally local) and rarely an outside film crew. No more than 2, must change into scrubs and cover their hair and shoes. They are NOT allowed into the OR suite itself. They come escorted by hospital security (usually the chief) and their weapons are locked in the safe with the drugs until they leave. There would be no crowd blocking the corridor. I have worked in some ORs were rules are lax but NOT security. There are separate protocols for mass shootings or terrorists situations like the OKC bombing.
The ONLY exception to this rule is if the hospital is designated for the POTUS. Each hospital on the list, all level 1 trauma centers, must have a team dedicated to the POTUS. You must be vetted and you will be given a security clearance. Anytime AF1 crosses into your airspace, the team must be fully available (not doing other cases) and the largest trauma suite is held open. If this is at 2am, then you are there standing and waiting at 2am until the all clear is given.
IIRC, there can be up to 6 SS agents accompanying the POTUS. They have all been briefed on OR policy and sterile technique The last thing we need to worry about is if they are dressed correctly, standing in the way or are about to touch something they shouldn't. 2 from this group will enter the OR suite. None of them give up any weapons. The OR is cleared of all unnecessary personnel the remainder of the hospital goes on lockdown. All in coming patients are diverted.
BTW - if anyone is considering a nursing career, might I suggest you look into Forensic Nursing. That would have been my speciality had it been available when I trained. These are nurses/detectives trained specifically to go into ERs and ORs to preserve any evidence that is usually contaminated during the normal course of treating a victim or suspect.
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