Talk:Gold Mine/@comment-24.6.35.175-20130104004532/@comment-5687967-20130104005413

You should do it anyway. Going from 7->8 starts being profitable in about 11 days. That's not very long.

Even the longest one is only 29 days. Basically if you plan to play the game for a while you should do it.

Once the waiting period is over they make profit forever. If you don't think you'll be playing 10 days after the upgrade finishes, then you might as well just quit now.