Recharge Times
From Destiny 2 Wiki
Unmodded skill recharge time is roughly 1:22 or 82 seconds.
Each cooldown-altering Armor Mod gives you a 10% multiplicative recharge reduction (i.e. the new recharge time for a skill is 82 * 0.9^(# Cooldown Reducing Effects) ). So adding more would result in this breakdown (it is only possible to have 3 copies of any specific kind of cooldown-altering Armor Mod active at once):
# of Mods | Recharge Time |
---|---|
1 | 73.8 (1:14) |
2 | 66.42 (1:06) |
3 | 59.778 |
4 | 53.8 |
Eye of Another World (the Warlock Exotic Armor) also simply acts as a recharge reduction mod for all abilities, so adding it would result in you having 4 multiplicative 10% reductions. AKA 53.8 seconds!