I dont have an exact time,, but on my second flight,, I tached it in the pits,, ( with care for other airplanes,, ) then went to the line and started-flew without retaching it,, I ended up with aas I recall 17 laps past the completion of the pattern. so given I did not tach it which generally leads to maybe thirty seconds,, I would say I gained about 40 seconds.
but that is not conclusive,, because typically I was running out in the first loop of the clover which acts as a cut off loop to the airplane,, regardless, it allowed me to complete the flight,,
the instances of running out in the overheads was rather early when it was still below 50 degrees air temp, so its hard to really use that as a good measuring stick