The time between filing an application for a loan and actually receiving the lender's decision can vary. It will usually take between one and 6 weeks to hear back and there is also the chance that the lender will ask you for more information. If you are asked for more information, try to remember that this is a normal procedure and it does not mean that you will be rejected.
Simply try to get the information in as soon as possible in order to speed up the process because the sooner you act, the sooner the decision will come. If you are approved, the lender will call you regarding a closing date on the loan. Once you meet with the lender and go over everything, the money is yours and you can buy the new homes that you have always dreamed of. If you are rejected, improve your credit score and then try again. It is not the end of the world.