Firestone Research Tree 16
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 12 hours 40 minutes for level 1 and increases gradually over the next 10 levels up to 22 hours.
| Level | Duration | 
|---|---|
| 1 | 12h 40m | 
| 2 | 14h 40m | 
| 3 | 16h 20m | 
| 4 | 18h | 
| 5 | 18h 40m | 
| 6 | 19h | 
| 7 | 19h 40m | 
| 8 | 20h 20m | 
| 9 | 21h | 
| 10+ | 22h |