So-far, all comments on this thread are about the general concept of timing attacks...
You're asking a different question, though. You're asking about precision.
The answer here is that in many cases timing attacks pose a theoretical risk, but they can't be exploited in practice due to a low signal-to-noise ratio.
It really depends on the attack vector.
Measuring the latency of a network call (TCP) from across the other side of the world, as an example, is going to be too noisy (in many cases). Especially if the attacker wants to remain covert.
You're asking a different question, though. You're asking about precision.
The answer here is that in many cases timing attacks pose a theoretical risk, but they can't be exploited in practice due to a low signal-to-noise ratio.
It really depends on the attack vector.
Measuring the latency of a network call (TCP) from across the other side of the world, as an example, is going to be too noisy (in many cases). Especially if the attacker wants to remain covert.