Hi buddy,
how are you doing?
Let's figure it out step by step, OK?
I believe it depends on your purpose and your determination.
Purpose:
1. enjoyment (e.g. TV programs, movies etc)
2. communication (e.g. job hunting, make friends etc)
3. exam ( toefl ibt, GRE, GMAT or CFA etc)
Determination:
The price you are going to pay in form of time and money.
The last two is time sensitive missions, but will enhance your competitive capability in the near future.
You'd better make the following clear in order to calculate your load:
1. Target level (content, capability and efficiency)
2. Time available (effective time at your hands)
3. Notes available (official guide)
With your load, and your time slot,
you know your pace easily.
The rest of your work is pretty simple,
stick to it and
never give up
until you make through and
finally get there.
Time is very limited.
Set a challenging goal for you, for your future and for your happiness.
Good luck my friend. :)