I am graduating in May 2010 and I wish to have my parents apply for their US visas for my graduation. However, I only want to invite my parents once I relocate and have decent savings under my belt. The question I have in mind is whether my parents will be required to enter the US within a certain number of months once they get their visas. Since the embassy issues 5 year multiple visas, I am running under the assumption that once my parents get their visas, they will be able to come to the US anytime within the 5 years without any contingency.