Only hardcore MMA fans will do well in this admittedly frustrating quiz

One or two will absolutely catch you out here.

Mixed martial arts is blowing up in a big way, thanks in no small part to a little-known fighter by the name of Conor McGregor. But each and every fighter whose name we need in the below quiz began competing long before the UFC hit the mainstream. We want you to give us the ten UFC fighters who have spent the most time in the Octagon in total, according to stats we've taken from FightMetric.com. It's tricky, we know, but let us know how you get on. If the quiz doesn't display for you, click here.