Time distortion
Time distortion is an effect that makes the passage of time difficult to keep track of and wildly distorted. It can be felt in two different forms: time expansion and time compression.
The most common of these is time expansion. Time expansion can be described as the feeling that time has completely slowed down. This generally seems to stem from the fact that during an intense hallucinogenic experience, abnormally large amounts of experience are felt in very short periods of time. This creates the illusion that more time has passed than it really has. For example, at the end of certain experiences one may feel that they have undergone any number days, weeks, months, years or even eternal and infinite periods of time.
The second form, time compression, is more common within stimulating substances than hallucinogens. It can be described as the experience of time speeding up and passing much quicker than it usually would within everyday life.