The body shutter will be the only concern, so I'd suggest having a second body (doesn't have to be a DF unless you need LS lenses) if you plan on doing many days like this and work into your budget a shutter replacement or two. You can also consider running this project using a view camera or technical body with an electronic shutter. Those are rated for 1 million captures and also have no mirror.
The IQ back will have no problem with this (except as someone mentioned if you want to shoot longish exposures, which require the same time to read-out as to capture). Make sure the laptop you are shooting to has more than enough free HD space (duh), and set the back's power-management setting to "fast" charging (draws more FW power, but if your laptop is on AC then it won't matter) to make sure that it is charging faster than it is depleting.
Also, consider using IIQ-S which will result in raw files about half as large as normal raw files. A quick comparison on your end will tell you if you are happy with the quality of IIQ-S, which is very slightly lossy compared to IIQ-L.
You should also follow the normal time-lapse convention of either using a lens with a mechanically set aperture (e.g. a Hassy 200 or 500 series lens with the appropriate adapter) or using a standard electronic lens and "tricking" the lens into remaining stopped down full time by ejecting the body battery while holding the DOF preview button. This will eliminate "aperture flicker".
Naturally you'll want to use an AC adapter for the body. That's cheap/easy from your local Phase/Mamiya-Leaf dealer.
My senior thesis was on time-lapse from still images; it's a wonderfully enjoyable, though EXTREMELY time intensive technique.