Before revision:  We analyze decision time distribution induced by all sequential information acquisition strategies that 1) implements a target information structure, 2) satisfies a constrainton flow informativeness of signal. The main result is that decisive Poisson signal creates the most dispersed decision time distribution (in mean-preserving spread order ), and the pure accumulation of information creates the least dispersed.
After revision:  We analyze decision time distribution induced by all signal processes that satisfy a per-period learning capacity constraint. I find that all decision time distributions have the same expectation, and the maximal and minimal elements by mean-preserving spread order ), and the pure accumulation of information creates the least dispersed.