It was several years until they saw God answer their prayer but He did. Last year my wife and I surrendered to go to Nigeria with the gospel, and our home church took on a missionary to Abuja! Next year we plan to move there!
Many times we may pray and get discouraged when we don't see an immediate answer. We ought to trust our burdens to God, believing that He will work and thank Him like He already has. He is a good God. He hears and He answers.