It can take some week to several years. Depending upon your niche, you quality of work, portfolio and your buyers returning rate.

If your niche is like web development, android development, video editing, digital marketing, etc then you can achieve this target with first 1 to 3 projects. Make sure that your skills are polished. 

If your buyers start trusting you then you can easily multiply you revenue. 

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But what about skills which are selling in $5 to $50 or less $100? 

So, these type of freelancers should upgrade themselves because such type of skills are not futuristic and after some decades AI will neglect such jobs.

So try to learn powerful skills. H-educate also comes with those type of videos where you can find upcoming trending skills.