Aqua Regia Gold

How to dissolve gold in aqua regia, and please tell me how long it takes?

Please provide the percentage of hydrochloric acid and for the preparation of nitric aqua regia.

The mixture is formed by freshly mixing concentrated nitric acid and hydrochloric acid, by usually in a volumetric ratio of one to three, respectively. It is one of the few reagents that dissolves gold and platinum. It is so named because it can dissolve the so-called real or noble metals, although tantalum, iridium and other metals are able to resist.