The runtime for 'Back in Action' depends on which version you're watching—the original cut or extended editions. The theatrical release clocks in at about 108 minutes, but there's a director's cut floating around that adds another 15 minutes with deleted scenes and extra character moments. I stumbled upon that version accidentally during a marathon and was surprised by how much those extra bits fleshed out the side characters.
If you're the type who loves digging into bonus features, some Blu-ray releases include an alternate ending that tacks on another 5 minutes. It doesn't radically change the story, but it's a fun curiosity for superfans. Personally, I think the theatrical version has better pacing, but the extended cuts are worth checking out once you've seen the standard version.