Firestone Research Tree 19
Research Tree
* additive effect
Unlock Requirements
The unlock requirements for each column are:
- Column 2 requires 7 levels in the previous research
 - Column 3 requires 8 levels in the previous researches
 - Column 4 requires 7 levels in the previous researches
 - Column 5 requires 6 levels in the previous research
 - Column 6 requires 6 levels in the previous researches
 - Column 7 requires 8 levels in the previous researches
 - Column 8 requires 10 levels in the previous researches
 
Research Duration
The research duration starts at 15 hours 40 minutes for level 1 and increases gradually over the next 10 levels up to 25 hours.
| Level | Duration | 
|---|---|
| 1 | 15h 40m | 
| 2 | 17h 40m | 
| 3 | 19h 20m | 
| 4 | 21h | 
| 5 | 21h 40m | 
| 6 | 22h | 
| 7 | 22h 40m | 
| 8 | 23h 20m | 
| 9 | 24h | 
| 10+ | 25h |