Must I manage one or two websites?

I had been pondering this question a lot and I just wanted to get some comments from you guys.
Hopefully This post will even be seen by those who have overcome this situtaion.
So the real question is "should a person focus on one website or two?
I know that this may seem obvious but it is not the case if you have tow websites that are doing well.
This question came because I am in this situation and I am managing two websites but I feel that this can be rather exhausting.
The reason I have two websites is becuase after I started the first one I discovered my passion was actually something else.
So I changed and started another website while still managing the first one.
The hectic thing about this is that both sites are doing well especially the first one (the one I am less passionate about compared the second one).
I have even thought about hiring writers to take over with my first one but I am not sure becuase I feel that I will still need to make them undertsnad what to write and how to write it.
Has anyone had such a situation and if yes how did you handle it?
I do not have a problem with running two sites but I feel my time could be used on doing other useful and productive things like the social media or other compaigns online to grow my buisness even more.
regards
Thabo
Christine
Jerry
Jeff