It depends on the severity of your illness and the paperwork you submit. Generally speaking, it can take a few months to a year or more to get approved for disability. It's important to note that disability is not just a medical condition. To be approved for disability, you must also prove that you cannot work due to your illness. This can be difficult to do, especially if your illness is not visibly apparent. In some cases, you may need to get letters from your doctors or see a disability examiner in order to prove that you are unable to work.
It depends on your condition and how severe it is. Generally, the process can take several months to a year.