Firestone Research Tree 21
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 9 levels in the previous researches
- Column 5 requires 10 levels in the previous research
- Column 6 requires 10 levels in the previous researches
- Column 7 requires 9 levels in the previous researches
- Column 8 requires 10 levels in the previous researches
Research Duration
The research duration starts at 17 hours 40 minutes for level 1 and increases gradually over the next 10 levels up to 27 hours.
| Level | Duration |
|---|---|
| 1 | 17h 40m |
| 2 | 19h 40m |
| 3 | 21h 20m |
| 4 | 23h |
| 5 | 23h 40m |
| 6 | 24h |
| 7 | 24h 40m |
| 8 | 25h 20m |
| 9 | 26h |
| 10+ | 27h |