Your time sense is perfect. The benefits of this are minor, but as the spell is passive, they are always in effect.

• You are always aware of the passage of time, and barring loss of consciousness, always know exactly how long it's been since a given event that you witnessed.
• You take favour on any skill check or saving throw in which careful timing is key. Note that this doesn't include those where perfect timing is merely helpful. Moving through a corridor full of oscillating blades would require perfect timing; dodging a sword thrust does not.
• You can sense when the flow of time is being manipulated, by making a Perception check.