How long can cubita pinched nerve last?

Short or long time: Depending on the cause, and severity of the initial injury. See a doctor who does emg/ncv studies, such as a physiatrist, and have the nerve tested looking for cubital tunnel syndrome. Treatment options can be decided based on the test , symptoms and physical exam findings.

Weeks or months: Weeks or months and if there is scar tissue it will not improve. Go see your neurologist for an examination and emg/nerve conduction studies.

Until healing: It is likely to last until pressure on the nerve is released, and the nerve heals from the injury. Nutrition, vitamins, infrared light, and more can be helpful before surgical release is considered.