Nearly twenty years after the Israelites first began their revival they finally completed the building of the temple. At the completion of it they sang praises, offered sacrifices and dedicated the temple to God. 
I doubt the Israelites thought it would take them two decades to see the results they were after. They could have quit completely but they chose to be revived in the midst of their revival.
Revival for ourselves may not follow the timeline we have made. This can be discouraging for us. The process can be tiring. Don’t neglect to pray for strength, a renewed passion and a desire to see it through. If we seek it God will provide in time. 
Scripture taken from: Ezra 5 & 6