Ann: High-Grade Cu-Ag-Sb-Bi Mineralisation at Rough Triangle, page-30

It all depends like others have said.

In my experience so far 3-5 years actually.

This is something I found a while ago from someone - The average length of time for a 10-bagger was almost 5 years. It was 50 months. Most investors’ time frames are two weeks, or three weeks, or a quarter, or something like that. You make money in exploration by answering unanswered questions. And to make a lot of money, you have to answer a series of unanswered questions. If you assume, as I do, that each individual unanswered question takes between 12 and 18 months, if you buy an exploration stock without the expectation of holding it for 18 months, you’re setting yourself up to fail.

Depends what you goal is...