More time does not always result in better decisions. More information may help, but more time just creates anxiety and can actually reduce the quality of decisions. Sometimes we are better off making a snap decision and moving on. This way we free up our most valuable asset; time.
Malcolm Gladwell describes in Blink how we are able to make certain kinds of decisions very quickly. He explains that great decision makers aren't those who process the most information or spend their time deliberating, but those who have perfected the art of "thin slicing." Thin slicing refers to the ability of our unconscious mind to find patterns in situations and behavior based on very narrow slices of experience. The unconscious mind is very good at filtering the few factors that matter from an overwhelming number of variables. For complex problems that don't lend themselves to logical decision making, thin-slicing often delivers a better answer than more deliberate and exhaustive thinking.
Rather than waiting until you have all of the possible information - which may never happen - make a decision and move on.