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Is this question about drivers that turn off their indicators while still mid-turn? Or about drivers that turn or change lanes in very little time at all?
IMO, the correct time to use indicators is precisely when in preparation for a turning or lane-change manoeuvre, during such manoeuvre, and that's it. Once the manoeuvre is done, the indicators should be extinguished to avoid ambiguity, unless a follow-up manoeuvre is planned.
I see no logical reason to enforce a prescribed minimum for indicator time, and it's why I see minimum-three-blink on some modern cars as an anti-feature. After all, there's no minimum (nor maximum) time to prepare and make a turning manoeuvre.
To use a USA example, the driving style of Los Angeles inter-city freeways is -- for better or worse -- going to necessitate fairly quick lane changes, because of the tighter spacing between cars. In hard figures, a lane change might be prepped and done in 3 seconds. Some might say that all these drivers are violating good driving behaviors for following each other so closely, but it's sadly a practical necessity when no amount of "just one more lane" can solve the systemic issues with regional road transportation there; it's why LA is doubling down on public transit building.
Compare this with changing lanes on a rural Interstate freeway to pass a semi-truck, where a lane change can be more sedate because there might not be any other traffic in sight except for the two vehicles involved. Smooth driving on a road-trip might have this manoeuvre prepped and completed over 10-15 seconds, as the car might also be slowly accelerating while also changing lanes. Sometimes on these two-lanes-in-each-direction roads, the driver might even continue using the left indicator, but it now unambiguously indicates that they intend to fully overtake the semi-truck, and will switch on the right indicator once fully ahead and they intend to return to the right-hand lane.
In both circumstances, the indicators should remain blinking while mid-manoeuvre. Anything short of that is "too quick" in my book.
But if your question is how far in advance should drivers begin indicating before the manoeuvre, that's a joint matter of regional convention and of law. And the former usually is the strongest influence.
TL;DR: indicators indicate intent, but some people have quick intent.
LA has infamously bad drivers. In many parts of the country people will slow down and give you space to move over when you have your signal on. They'll also known how to do a proper zipper merge.