How long did it take the Curies to get a sample of Radium bug enough to be recognized?

It took Marie and Pierre Curie several years to isolate a sufficient quantity of radium for their research. They began their work in 1898 and, by 1902, had isolated about 1 milligram of radium chloride. This small amount was enough to demonstrate the element's existence and its properties, leading to its recognition in the scientific community. Their meticulous efforts in refining uranium ore were crucial in achieving this breakthrough.