The time needed to accelerate the vehicle from a given start velocity to a given target velocity. Typical unit code(s): SEC for seconds - Note: There are unfortunately no standard unit codes for seconds/0..100 km/h or seconds/0..60 mph. Simply use "SEC" for seconds and indicate the velocities in the [name](http://schema.org/name) of the [QuantitativeValue](http://schema.org/QuantitativeValue), or use [valueReference](http://schema.org/valueReference) with a [QuantitativeValue](http://schema.org/QuantitativeValue) of 0..60 mph or 0..100 km/h to specify the reference speeds.