I had close to 30 days and I still felt "rushed" granted I took every part of my process deadly serious and according to my wife overly stressed about it. I'm sure I would have been okay without some of my prep, however I walked away from my interview feeling like I slam dunked it (I got the job at least), and while I was still nervious for that following week to hear the results I much rather over prepair for somthing like this than leave it up to chance.

I cant believe how many people after I got hired contacted me about app reviews / interview prep and showed hesitancy to spend a few hundred bucks on something that could be the difference between making a dream job.

The way I try to frame it for people is that if your interview prep / app review service gets you hired just one week earlier (it very well could be much longer) than it is money well spent. Additionally the skills gained can be applied to any interview beyond airlines.