Reply to Gig getting mixes

Looking at getting some gigs in Ibiza over the summer and a few more before I go so was wondering if anyone has tips for not just a mix, but in particular one for getting gigs?
Do a 30-40 minute one rather than an hour?
Approach it like a set, with something calmer at the beginning and a peak later on?
Or just go for it from the off to get them hooked?

I know there's plenty of threads like this but none that I've seen focussing specifically on the mix rather than just getting gigs in general (which isn't so much of a problem over here but in Ibiza the competition is HIGH).