Can you solve the bridge riddle? .#4

Taking that internship in a remote mountain lab might not have been the best idea. Pulling that lever with a skull symbol just to see what it did probably wasn't so smart, either, but now is not the time for regrets because you need to get away from these mutant zombies fast. With you are the janitor, the lab assistant, and the old professor. You've gotten a head start, but there's only one way to safety: across an old rope bridge spanning a massive gorge. You can dash across in one minute, while the lab assistant takes two minutes. The janitor is a bit slower and needs five minutes, and the professor takes a whole ten minutes, holding onto the ropes every step of the way. By the professor's calculations, the zombies will catch up to you in just over 17 minutes ( > 17 minutes), so you only have that much time to get everybody across and cut the ropes. Unfortunately, the bridge can only hold two people at a time. To make matters worse, it's so dark outside that you can barely see, and the old lantern you grabbed on your way only illuminates a tiny area. Can you figure out a way to have everyone escape in time? Remember: no more than two people can cross on the bridge together, anyone crossing must either hold the lantern or stay right next to the person who is holding it and any of you can safely wait in the dark on either side of the gorge. Most importantly, everyone must be safely across before the zombies arrive. Otherwise, the first zombie could step on the bridge while people are still on it. Finally, there are no tricks to use here. You can't swing across, use the bridge as a raft or befriend the zombies. Please write your answer in the solution chat!

A lot of thanks for the YouTube Channel, Ted Ed who gave me the riddle. ( Also thanks to Andrei Zonga for reminding me to add this in)

But here is a riddle for you to answer:

What comes once in a minute? But what come twice in a moment? And doesn't come in a 1000 years?