We recommend that you spend at least 6 months preparing your first application to ensure you can put together a thoughtful application. However, if you need to rush, it's doable in 2-3 months (though if you don't have your GMAT, 2-3 months will be complicated). Once you apply, you'll prep for interviews and receive your answer about 4 months later. So, all in, anywhere from 6-10 months for one school.
For additional schools, it really depends on the person, but I'd give yourself 2-4 weeks for each additional application. I'd advise against rushing to ensure that you can put together your best application! of course, in this scenario, the 4 months post-application doesn't change, since all schools notify around the same time.
ManifestDreamMBA
How much time the whole process take from start to finish? Let's say for 1 application and whats additional time is required for any additional application?