This cannot be determined exactly. If you plant apple seed, it will take at least about 5 years before you get the first fruit. If you buy an apple tree and plant it, it can be assumed that you will have the first fruit in about 2-3 years. Then it depends on what type of tree you buy, what the conditions will be, and how you will breed it. It is also not clear how much fruit you want to make. You can have one apple in those 2 or three years. If you want 100kg, count about 10 years.