I'll take the Burger. NO NO NO the Burrito. Wait no, the chili dog. JUDGE!!!!!!!!! - BRONZE
And a good gauge for timeliness could be the other player. If we assume that Antonio didn't rush through sideboarding and shuffling, the amount of time that he took is likely “reasonable.” (We don't know how long it was, but nobody was waiting on him to finish at any point.)
Once Antonio presents, now we're waiting on Nelson. Nelson gets some time (maybe he's just not as fast as Antonio), but at some point, he has to realize that the game/match are being held up for him.
If we arrive and can tell that Nelson has clearly been distracted by his friend, it seems like an easy Slow Play call. Guidance that I've read is that “if you think there's some Slow Play happening, you're probably right” and so I'm inclined to extend that to “If a player is slow enough that you've been called, it's probably an infraction.” (Obviously, you don't indicate that to players, or you get a lot of calls about “slow” play that's hardly Slow.)
As for the hard figure, it used to be 3 minutes, so if we're well over that (we must be if he stopped sideboarding to talk about lunch and has been doing so for “a few minutes” since “a few” to me means “about 3”), it's time for a Warning.