I am a corporate C# programmer. I found some time to invest into myself and stumbed upon a dilemma. Where to go from now? C#/.NET is easy to learn, develop for, etc. In future I would want to apply to Microsoft or Google, and want to invest spare time wisely, so what I will learn will flourish in future.
So: Python or C++ for a C# programmer? I am a little scared of C++ because developing anything in it takes ages. Python is easy, but I take it as a child-play language, which still need lots of patching to be some mature development tool/language.
Any C# developers having same dilemma?
I Am a little scared of C++ because developing anything in it takes ages.

I'm not sure how you can say that when you say yourself that you have no experience in the language.  C++ is a good tool for some things, Python is good for other things.  What you want to do should be driving this decision, not the technology in and of itself.
C# programmer or not, I would assume that you can pick up any language, but a language is just a tool, so your question is difficult to answer.
C++ or Python for C# programmer?