Even 1 second is still too long. No matter the distance for creating a light trail, it must use a shorter time frame because the light trail we see is the afterimage left by Saitama. A 1-second time frame would make the afterimage disappear before 1 second is up.
And the timeframe for creating a light trail in the story should use at least 0.1 seconds to create the light trail. Garou cannot create a light trail in 0.1 seconds from the
perspective of a normal person, which means the light trails that appear during
FF vs Garou vs PS must occur in less than 0.1 seconds. We can infer that the timeframe for creating the light trail must be at least 0.1 seconds.