Hab 2:2 Then the LORD answered me and said, "Record the vision And inscribe it on tablets, That the one who reads it may run.
We need first to have picture that we can believe in and then it outcome will be certain. Prov 29:18 (KJV) Where there is no vision, the people perish. Or in (ESV) Where there is no prophetic vision the people cast off restraint. Vision gives the guides.
Pro 23:7 For as he thinketh in his heart, so is he
Follow me and I will make you fishers of men Mt 4:19.
John 3:16 "....whoever believes in Him should not perish, but have eternal life."
John 7:38 "He who believes in Me, .... From his innermost being shall flow rivers of living water.'"
John 8:32 and you shall know the truth, and the truth shall make you free."
John 11:25 Jesus said to her, "I am the resurrection and the life; he who believes in Me shall live even if he dies,
Mat 11:28 "Come to Me, all who are weary and heavy-laden, and I will give you rest.
Where are the measures and the timing?
The above vision statement like "become fishers of men" is visualized mission statement of "Go make disciples". Jesus used fishers of men because Peter and the others are fishermen. They will understand the vision and mission well.
The measurement of the catch is very obvious - the number or the weight of the fish caught. The best measurement is one that is very easy to see. You don't need to have an instrument to tell. A good one is reaching a destination. When you reach a destination, you know you have arrived.
Putting a man on the moon by end of the decade is a good vision statement.
The measure is obvious - a man landed on the moon (alive and return is implied).
The timing is before the end of the decade (it was by 1970).
Jesus did not specify the targets and timing then. It was up the disciples each to determine for themselves when they followed Jesus and learned more.