I've never seen anyone take two seconds to figure out it was time to stop with a failure, most folk have the thrust levers retarded within half a second. So figure another 30m or so if your failure happens ever so slightly under V1.
Having observed numerous rejected take off's in the 737 simulator it has been my experience that on almost every occasion the airspeed kept increasing by around seven to ten knots as the thrust levers were in the process of closing. This was regardless of speed of throttle closure. These were ordinary garden-variety pilots - not test pilots.