We should have the ability to send an extra builder to help finish a building
Say I'm upgrading an item that take 6 hours costing 60000 goldI should be able (making the total resource cost 50% more than it was) to send another builder to work on that item to decrease the time ( not nessecarily in half maybe 1/6 of the time) so the upgrade rate will be
2 builders 90000 gold 5 hours
3 builders 120000 gold 4 hours
And so on and so on
