Hebrews 5:12 In fact, though by this time you ought to be teachers, you need someone to teach you the elementary truths of God’s word all over again. You need milk, not solid food!
How long does it take for you to understand parts of the bible? How many time do people have to explain things before you get it?
It takes us different times because we are all different people with different minds – we do not all learn in the same manner or the same speed.
Take in what you can understand and at the speed you can – don’t get upset you cannot keep up with others of that you will not be able to tell others about what you have just heard.
God will open up His word to you through the right people at the right time.