[markokocic]

After learning a couple of (different) languages, learning the new one is easy. So easy that it usually equates learning its standard library. So learning either Django or Rails, if you are moderately experienced developer shouldn't really take more than a few weeks.

Of course, learning the first language is challenging.

[rednukleus]

I have become proficient in about 10-15 languages over the years, but Python is sufficiently different from all of them that 2 weeks is not enough to give Django a fair trial. I'm sure Rails is the same. Knowing 80x86 assembler, Commodore 64 basic and Amos only go so far, but maybe knowing Python it is easier to switch to Ruby.