Crack in my radius.about how long until i can take off my splint?

Ask your doctor: It depends on where the crack is and the degree or severity of the crack. Your doctor has seen the x rays and can give you the best answer, .

Depends: Depends on the severity of the "crack." if it is a confirmed non-displaced fracture, then typically it would be immobilized 4-6 weeks with confirmed healing on x-ray to come out of the splint.

Typically 6 weeks: It varies somewhat, but typically a non displaced ("crack") fracture of the radius takes approximately 6 weeks to heal. Don't hesitate to discuss the specifics of your case with your doctor.