Exploration is a way of gaining land besides having to attack someone.
You can explore for an additional 10% of your total current amount of land.
However eventually exploring land becomes expensive. The more land
you gain, the higher the cost of hiring explorers.
You pay for an expedition of explorers to go out to find new land. Every expedition
will take 12 hours for all of the explorers to return. If your expedition has more
than 24 explorers, then some of them will start returning every 30 minutes until the
12 hours period has elapsed. Sending an expedition with less than 24 explorers will
cause the individual explorers to take longer than usual to return to you.