Oh Mel, you planted many seeds! You never fail when giving the Word of God to anyone. The best indication to this is: My mother prayed often for us seven children, she believed we would all be saved. She rested in that faith, despite the fact that we were all living in the "world" having "fun", doing things we ought not do.
Well, after she passed, in our own time, we all did come to believe in Christ as our Savior! Not all at once, but one at a time a year apart, a month, and many years later. So, not all at once and she did not live to see her prayer answered :)
You will never, ever fail when you give the word. His words go on forever and His timing is not ours...what I do is, pray for the circumstance, thank God that He heard your prayer, from then on, I simply thank The Lord in my regular prayers that He heard my prayer an is working on it, amen!