Talk:Gold Mine/@comment-24399087-20140108220820

The catch up time is incorrect. It doesn't take into account that during the upgrade the mine is down and doesn't collect resources. The correct catch up times are as follows:

Level 1: N/A

Level 2: 10 minutes

Level 3: 45 minutes

Level 4: 4 hours

Level 5: 10 hours

Level 6: 26 hours

Level 7: 2 days 16 hours

Level 8: 6 days 8 hours

Level 9: 14 days 16hours

Level 10: 25 days

Level 11: 24 days

The reason these are the correct times is because you have to concider the fact that the unupgraded mine has a headstart in collecting resources. Consider the first upgrade you make from level 1 to level 2. When you click upgrade the level 1 and level 2 would both have collected 0 gold. After 5 minutes the level one mine would have collected 16.67 gold, but the newly upgraded level 2 mine still has 0 gold mined. After 10 minutes both the level 1 and level 2 mines have collected 33.33 gold. So in fact it take 10 minutes for the upgraded mine to truly catch up.