I would be honest in this, 1> after you complete writing a good hubpage which is according to you is good but might not be searched a lot on google [its the main source of traffic for us hubbers].
2> Even if it is searched, it will take months for your hub to feature on the main google page 1, no one goes for second or third page.
3> To earn $50, you need around 25,000 page views + I am assuming that you have a CPC Of 2%
My experience - I have earned $173 only in 1 day [My highest] with page views of 1,40,000.
So I suppose you have a chance of doing it in 1 month at least.
But be not swayed, understand the hard fact that it requires years of patience for some to achieve enormous success.
Also, if somehow your presentation and vocabulary is good, it might be featured on main hub page and this might be like striking a gold.
All the best for future writing hub.
If possible try to write on things that have happened recently or write for which is being searched every day or even you search for mostly.