The sum of an instrument's key rate durations is approximately equal to its modified duration. Different formulations have varying durations of effect. Studies have shown that they can also learn to simultaneously time multiple interval durations. The state pyramid has varying durations and schedules in each state. Mgen is a fastidious organism with prolonged growth durations. Side effects from supplements are minimal at low doses for short durations. Negative outcomes can also be associated with the long durations of hospitalization. Right whales also make a variety of other frequency-variable calls of different durations. This can be done for displacements (lengths), durations (time), and angles (rotations). Semen cryopreservation can be used for far longer storage durations. Colder water is associated with longer durations in each stage. Different plants require different amounts of light, for different durations. The spiral incense coil was used to measure time for longer durations. This can be very time consuming in large studies with data recorded over long durations. Scanning speech is an ataxic dysarthria in which syllable durations are equalized.