Many years ago I did a high speed abort in Viscount 800 just at V1 after multiple bird strikes (we later found 23 dead seagulls on the runway). The Viscount did not have reverse thrust propellers but a ground fine position which gave impressive drag.
During normal landings the props were close to the fine pitch stop and the ground fine selection was accompanied by a distinct increase in noise which, when coupled with noticeable decelleration, indicated that you were in ground fine.
When the throttles were rapidly closed at the start of the abort I was surprised at the lack of immediate sound of ground fine and also lack of decelleration for the first few seconds. In fact I thought that ground fine had somehow failed to engage. Ground fine had engaged however, it was just that it took some time for the pitch of the props to change from high speed take off angle down to where the ground fine angle bit in. My guess about 5-7 seconds which seemed like an eternity.