"West" (the opening leader) has to lead before seeing the dummy. Both declarer (South) and partner (East) ought to study the dummy before playing. But often they do not.
Suppose South wins the trick, and leads back quickly. Can West ask for a timeout to study the dummy? Does it have to be before South makes the lead?
Can any player ask for a timeout to study the hand at a critical juncture (say, if a squeeze play is on)?
One reason I ask this question is because it appears to be unethical to hesitate at certain points (e.g. representing an honor, when you don't have one).
This is a "companion" to one of my other questions.
In Bridge, Is There A Way To Shorten "Reaction Time" For "Real Time" Play