Interestingly, our dynamic IP appears not to be as dynamic as Verizon indicated. We were told that IP addresses were reassigned every 48 hours. We're currently at about 60 hours without, I believe, a change of IP.
It'll be cool if it turns out to be "effectively static once assigned".
(Which is to say, 48-hour minimum lease time but they won't actually expire the lease while our connection is active.)
Footnote: I have got to get a new chair that gives me decent back support. The only thing I have to sit on right now is a wooden stool and it's killing my back.