I can't tell you strict time frame I need for design(PHPLD), but it ranges from 4-10 days for PSD design.
Coding takes me 4-5 days but depending on playout can also take more.
Overall, I think 15 days is average time frame for PHPLD template.

I can code html and css in 1-3 hours depending on complexity.

Maybe I am really stupid to spend this much time on every phpld template, but I don't want to end work before I am happy with everything, even if client is happy in earlier stage.