Couldn't find it on the list: time for getting new client.
I've been doing the contracting thing, where the client hires me to extend their on-site team. Recruitment agencies call me, I have an intake over the phone with the client and then meet them face-to-face. So I don't recognize the things mentioned like "fixed-price contract", I just have an hourly rate. You can spend anything from a couple of months to a couple of years working for the same client.
I very much like it, but I work 4 days a week. That one day a week is really useful when the contract ends, because then you'll have to start emailing recruiters, looking for the next project. The phone and face-to-face interviews take hours, and it's hard to stuff that away in the usual 9-5 business hours.
The iOS job market is great currently, so it's not hard finding a project.