you dont need *time* to learn OLL/PLL per se. Don't be afraid of it, and just learn them one at a time as days go by. Don't set any goals, just have a printout of the algorithms next to your cube or something, and if you see some easy cases that you see are occurring frequently, then just give it a shot... my point is, don't be afraid of it! There is like 20 cases in OLL's that are like really trivial anyway, and can be memorized very easily too.
i learned around 20 OLL cases in a month and I was barely trying... Also, I find that they become easier to learn the more and more you already know.