u can do it within 100 turns on duel map.

general strat:

1. use greece. mass horses/archers. get honor.
2. if there's a militaristic city-state nearby, it will help you for 10 turns for 500 gold.
3. only attack the enemy capital. you kill 1 capital city and u win.

super cheap tricks:

1. steal worker from city-state then declare peace on them. you can save a lot of time by doing this.
2. pillage enemy city-states then declare peace on them.
3. trade gold/turn, luxury resource, strategic resource for gold before declaring war.

You can do it within 100 turns on duel map.

General strategy:

• use Greece, amass horses/archers, get honour
• if there's a militaristic city-state nearby, it will help you for 10 turns for 500 gold
• only attack the enemy capital, you kill 1 capital city and you win.

Super cheap tricks:

• steal workers from city-states and then declare peace on them. You can save a lot of time by doing this
• pillage enemy city-states then declare peace on them
• trade gold/turn, luxury resource, strategic resource for gold before declaring war