The issue is that I am studying in college for now & don't have enough time to manage a site on daily basis.
I have a day or 2 per week in which I can work on it.
In other words I need a passive income while doing my primary work
You really need to invest a lot of time in order to earn big in the crypto currency world. If you only have a day or two per week, then you wont be able to earn much - not even from signature campaign since most of them have minimum weekly/monthly requirement.
For my site,
http://bitrevenues.com/ without any effort in promoting it, I noticed that my site receive less than 100 claims per day. All that changed when I become less addicted to gaming and started to put in a lot of effort into my site. Today, I am receiving close to 200 claims.
.
Unless you come up with an idea to create a site that do not need any effort at all, you wont be able to earn big amount in the cryptoworld with just one or two day(s) per week.