Does writing Good code take time or I am just slow?

I am a beginner, I've been programming for last one and a half year I can pretty much make my code what I want it to. I have not worked with any other programmer yet, So If I have to I do the frontend designing to the processing code to the server maintenance. So I was writing the processing code a while ago, It will be around 700-800lines long splitted files(with comments). It takes me quite a white (hours) thinking about how I will solve the problem, there are quick solution that I can run into but I think for a better one ( that too what my institution tell me ) I have not done any algorithm analysis or anything. I will start on that soon.

But does writing good code take time and thinking or I am just slow?