By Eli Segall, Las Vegas Review-Journal

When a “Do not disturb” sign hangs outside a hotel room for a while, staff will usually call or knock at some point to make sure everything’s OK.

But in the wake of the Las Vegas massacre, hotel operators may be asking themselves: How long should we wait before contacting guests who want to be left alone?

A gunman broke two windows in a 32nd-floor room at Mandalay Bay and sprayed bullets at concertgoers across the street on Oct. 1. Armed with at least 23 firearms, he killed 58 people at the Route 91 Harvest festival and left nearly 500 injured in the deadliest mass shooting in modern U.S. history, and then killed himself. He may have been able to prepare for the attack because housekeeping staff didn’t enter the room for some time.

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