That's the big thing with starting any fruit tree from seed - it's a gamble. It does take years and much nurturing to see your first fruit. Then years more to get any amount of fruit.
Then, the fruit you get will not necessarily be the same as the fruit that the seed came from because it very likely was cross-pollinated and almost surely came from a grafted tree. So, you could grow a fruit tree from seed for 4 years, finally get something to taste and find out it's not any good.
If I might suggest, this is a great time of year to buy fruit trees when the local nurseries are clearing out their stock at big reductions. My son bought three Gala apple trees for $13 each for his house a few years back. They bore apples the next year. If you fertilize and spray responsibly, you will get wonderful organic fruit many years sooner than raising from seed.
