487 : End of The Age Advice Until the Messiah Returns

Why did God not reveal to Apostles at some point that the second coming of the Messiah was not going to happen for thousands of years​? Clearly that would have been a DE-motivator for them, and hope would be stronger otherwise. God loved and was doing what was best for them spiritually. Apostles, such as Paul, John and Peter received revelations from God but not this information.