Double candy egg hatch

Probably not for a while. I'd robabaly just start incubating them right now as they could potentially hold some pretty good iv rare mon, or even just getting hatch candy for rare pokemon

There's generally some time between candy bonuses of any sort, I'm pretty sure you'll get new 10ks before we get double hatch candy. The next event might not even be until valentine's.

Besides, do you really need Trapinch and Mareep candy that bad? The 10k pool is currently extremely diluted and contains a lot of pokemon that aren't that valuable. The 7k pool on the other hand has new babies for pokedex and Riolu.

I'd wait to sync them up with the upcoming double stardust event and try to hatch them all with a starpiece going