Each incense burned will last for 10 minutes; the timer can be increased up to 60 minutes by burning more of the same type incense. As the timer runs out, it is possible to burn more incense to boost the time. You cannot exceed 60 minutes, so do not burn a new stick with more than 50 minutes on your timer.
At level 71 it is possible to acquire the effects for 2 different types of incense at once. And at level 95, you can acquire the effects for up to 3 different incense types at once.
When the first incense is lit, it will be at level 1 potency. For each additional stick burned and 10 minutes that pass, it will increase one potency level - up to level 4 potency. Increasing the potency will increase the strength of the effect. Note that you do not need to consistently keep 40+ minutes on your timer once you reach level 4 potency; you just need to burn more incense before the timer runs out to maintain the potency. It is possible to skip the 40 minute wait for level 4 potency if you "overload" the incense - achieved by Right clicking a stack of incense and choosing that option. Using the "overload" option will cause the effect to only last for 10 minutes total, so you will need to burn additional sticks to increase the time (9 incense sticks for full potency and full time when initiated).
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