Rituals do not have cooldown - BUILD v2.0.7f1
Windows 7 64 bits
CPU: Intel i3-4170 3.70GHz 2 Cores, 4 Logical Processors
GPU: NVIDIA GeForce GTX 970
God Mode Enabled
Note: This is not a repeat of the report of: https://support.brightrockgames.com/communities/1/topics/5126-minions-keep-charging-armageddon-even-when-finished-build-v206f2 it just uses the same bug as basis, which leads to the bug i am reporting now.
With the ritual of your choosing ready, activate it and immediately click on it again for minions to start charging it without the grey bar that is the cooldown stopping you. But once you do it once all subsequent rituals work as intended as well the cooldown.
Hard to replicate on top of needing another bug to happen that was also hard. Saving and reloading do not seem to trigger this so far.