hmmm i think tyron once mentioned in a twitch stream (via the chat, he was watching most of the evening. The streamer was Gronkh, the most well known german let's player) that temporal areas (and i think the storms as well) have no effect on how fast processes finish right now.
He also mentioned that he liked the idea of, for example, fields growing faster in a temporal unstable region as "time flows faster inside" which would lead me to the conclusion that it will probably added at some point.
As for the stream, i'm gonna drop a little link Vintage Story Stream with Gronkh (german) it's also the stream that made me (and probably a lot of other german speaking people) buy the game. Might have been the best puplicity the game got until now, at least in german speaking countrys.