Number of days before I had to increase Verizon iPhone plan from 2 gigs to 4 gigs: 4.

VZW Support @VZWSupport:
@jeffporten Sounds like you’re really going to town with that data on the best network! Luckily doubling your plan is a cinch! ^JHK

(Addendum: I wasn’t saying this was a good thing. More in an upcoming post.)