Maybe a year? they have a lot more then just HDR to work out.

Unfortunately, last I heard this was still years away from being ready. I think the specifications in Wayland are being worked on. Then once that is complete specific implementations of Wayland will need to build it out. Then once that is complete applications will need to build out the functionality. So I’d say optimisticlly 3 years but realisticly I’d guess at least 5 years