For me it's currently a stable and passive source of $20 dollars a day, that is the current goal and I've given myself close to 5 years to create such a source.
It's easy making that much actively, when the economy is doing alright and the business deals we get here are coming from both left and right; earning $20 dollars a day becomes easy then. But when we shift to the passive category, making $20 to $10 dollars even becomes difficult, that's where the obstacles reside, especially if we're looking for stable and "safe" options.
Yet, it surely is possible though, it will just take quite a bit of time, and a bit of magic with compounding effects.