This will be a huge letdown for my new strategy. I was planning on rotating through Chase co-branded cards getting a new signup bonus every 6 months for a different card then cancelling later, and by the time I came back around to the same card 24 months would have already passed so I could get the bonus again.

Looks like I will have to do the math and schedule my apps now if the co-branded cards move to 48 months, looks like I would still have the same strategy but instead getting a new card every 8-10 months or so.