From Wiki Grepolis
In the Barracks you can recruit regular troops and Mythical units. The higher the expansion level of the Barracks, the more quickly you can train your troops.
Max Level : 30
|Level 1 to Level 9||Level 10 to Level 19'||Level 20 to Level 30|
Please note: Times stated here are for a single speed world. If you are on a world other than speed 1, divide by your world speed.