Marathon speed:
Total turns: 1200
One turn is
20 Years, until 2000 BC (100 turns)
10 Years, until 1 AD (200 turns)
5 Years, until 1000 AD (200 turns)
2 Years, until 1700 AD (350 turns)
1 Years, until 2050 AD (350 turns) -> time victory condition
Epic speed:
Total turns: 660 turns.
One turn is
40 Years, until 2000 BC (50 turns)
25 Years, until 1000 BC (40 turns)
20 Years, until 200 AD (60 turns)
10 Years, until 1000 AD (80 turns)
5 Years, until 1650 AD (130 turns)
2 Years, until 1850 AD (100 turns)
1 Years, until 2050 AD, (200 turns) - > time victory condition
Normal speed:
Total turns: 460
One turn is
40 Years, until 1000 BC (75 turns)
25 Years, until 500 AD (60 turns)
20 Years, until 1000 AD (25 turns)
10 Years, until 1500 AD (50 turns)
5 Years, until 1800 AD (60 turns)
2 Years, until 1920 AD (60 turns)
1 Years, until 2050 AD (130 turns) -> time victory condition
Quick speed:
Total turns: 320 turns:
One turn is
50 Years, until 1000 BC (60 turns)
40 Years, until 1000 AD (50 turns)
25 Years, until 1500 AD (20 turns)
10 Years, until 1650 AD (15 turns)
5 Years, until 1900 AD (50 turns)
2 Years, until 1950 AD (25 turns)
1 Years, until 2050 AD (100 turns) -> time victory condition
Courtesy of Spiceant's
Cultural Victory: Notes and Tips