UFC 272 Free Fight: Jorge Masvidal vs Nate Diaz
https://www.youtube.com/watch?v=mYdfLcXnTfQ
How long do UFC fights last? UFC fight can last either 3 (non-championship fight) or 5 (championship and main event fight) rounds. Each round lasts for 5 minutes with a 1-minute rest in between rounds. That means that 5-round fights last for 29 minutes, and 3-round fights last for 17 minutes.
UFC 272 Free Fight: Colby Covington vs Robbie Lawler
https://www.youtube.com/watch?v=XFXimgPTBNU