[Hey, Jetfire could use the terms he's used to, using orns and deca-cycles and whatall!]

Ah, I see... Hm, well, the closest term I would naturally use would be deca-cycle. It's not quite as long as an Earth month, either going by standard calendar length, or a full moon revolution.

[The mention of having no way of knowing causes him to slump slightly, and there's the faint noise of metal on metal as he drags a hand down his faceplates, then pausing over the lower half of his face. The sigh is muffled.]

I see... Yes, someone else said... the same thing.

[That same note of restrained near-distress is back in his voice again.]