There are many cycles and a cycle is forever. Example when you buys 1Em rate, you joins a cycle, you buys 3Em you joins another cycle. After new position addition to the cycle the first 5 positions get bonuses and go to the end of queue, i.e. right after the new position.
1 cycle = 100EM. When the cycle has the 100EM, it will be split to 2 new cycles (50EM/Cycle) and the new cycle will continue.