In the “The Science Study Series” book The Physics of Television,1 it is stated that persistence of vision lasts for about a tenth of a second. This will be a notional figure just as 25 cm is taken to be the least distance of distinct vision. Estimates range from 1/8 to 1/16 s.

1.
D. G.Fink and D. M. Lutyens, The Physics of Television (Heinemann, 1960), p. 21.
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