I have a question on the 1961 French GP fastest lap time.

Looking at the ebook version of the Autocourse 1961-62, it show Phil Hill set the fastest lap at 2:27.1. Other sources have the same time and show it happened on lap 20. Looking at the lap time chart in Autocourse there are no times show that at less that 2:30. Does anyone have a source for lap times other than Autocourse or a different fastest lap time?