See attachment.
No way that this distance has a deposit-workyard time of 2 min 14 seconds.
I think it has something to do with the order in which I did things.
I first build + upgraded the marble mason. At that time there was a production time of 13.44, since the closest marble deposit is at long distance.
Then I find the marble deposit closer by. The production time remained 13.44.
Even after logging of and logging on, still 13.44.