Ceremony is set to start at 12:00 Noon. Preliminary events include playing the National Anthem,prayer of invocation, VP taking oath of office. I would figure on that taking 15 minutes ( not counting any disruptions by sore loser Democrats).
I can’t imagine any disruptors getting anywhere near the actual swearing in ceremony. It’s normally held on the W side of the Capitol Building, up a few flights of stairs that for the ceremony is filled with VIPs, military, bands and choruses .... not to mention, snipers on every building and in most trees between the Capitol and the White House. And we can’t leave out the tens of thousands of Trump supporters who will be filling the Mall right below the Capitol. Any disruptor showing up there would be readily dispatched.
You will have to have a photo ID and been cleared by SS to get within the parameters of the event. The disruptions will be in other parts of town.