How long would it take to get an Associates degree in business administration if you have already got 25 credit hours from previous schooling?

It depends on the specific program of study (major), and whether the credits you have already completed fit into that major, and whether the courses are equivalent in content and credit hours with the appropriate passing grade. For an overview of the associates degree, read the following.

The associates degree is designed as a two year program of study as a full-time student provided the student takes the degree as prescribed by the college, and provided the student does not require prerequisite coursework as a result of basic skills testing. There are some programs of study that may take a bit longer depending on the number of credits required. Usually these are programs within the health related fields. In addition, for students who require developmental course work as a result of basic skills testing, it would take longer. How much longer would depend on the extent of the developmental courses they are required to take. Evidently, those individuals who attend college on a part-time based would also extend their time in school. How much longer would depend on the credit load carried each semester. Typically, an associates degree takes between 60 and 64 credits to complete depending on the specific school, program of study, and state mandates.