Hey,
I wouldn't focus on the actual time that you spend with studying - just make sense out of your materials and time. The goal shouldn't be to achieve the certification as fast as possible but instead to understand every required point.
However, I guess if you study on a daily basis 1-2 months for the CCSA and 3-4 months for the CCSE can be realistic. Of course there are people who need more time and also some that can do it in much less time. Nevertheless, as mentioned before, just focus on your studying process and keep the certification goal in the back of your mind if that makes sense. 🙂
Here are some points that should be helpful:
> build a lab, do whatever you can and read about yourself
> play with the lab, break something of the configuration, fix it and repeat
> get familiar with the exam topics (see here for CCSA and here for CCSE)
> read the admins guides
> be part of the community, read through the latest threads (regarding news, problems etc.)
>>> keep track on threads that describe problems and also solutions
> espcially for the CCSA the official study guide points you in the required direction
> the CCSE study guide is still based on R77, but I did a write-up last October to what to expect and how to prepare for the R80 CCSE, you can find it here (I try to keep it up to date with further information that I can find)
> there are lots of different threads where the same questions were asked, with some more information that could be helpful, like for example this one
Regards