I only can speak for VV, though I assume things are similar for VS. More builders on a building = faster building, yes. More farmers on a farm = more crops brought in sooner, but the growing season for the next harvest does not necessarily come faster. I assume that the replenishment of the farm comes in regular intervals similar to that of the berry bush, but I haven't done enough experiments to verify that, and sometimes the amount of time needed for the next harvest seems outlandishly long. If only we had a couple more farms so the villagers could practice crop rotation.
