Does hourglass boost walking Calamity?

No change in damage tooltip, but it adds the 10 second cooldown

I dont think so, not sure if its a bug or if GGG has by mistake shown supports that don't work well or at all with the Walking Calamity even tho you can put it there.

I think GGG did NOT test Walking Calamity properly, there is a lot more support gems I've found that doesn't seem to work at all with this skill, that you can still put it on.

Something I found out is that its a Trigger skill, it casts once every 0,75 seconds or so, Hourglass is only for skills you cast yourself, now you cast the Walking Calamity but, the meteors are technically not cast by you.

Rageforged also, because it spends on each time a skill is used, it takes all your Rage without benefit. Cuz it triggers like crazy.