Java Programming

hello

I know that this is not the way we calculate the productivity of a programmer

but I would like to know how many line a normal programmer would write per day .???

how do u calculate the time needed to finish a project or a programme ??

for the moment ,I write 800 lines per day (8 to 9 hrs) if the subject was easy

and I write 200 lines per day if the subject was difficult

in both cases I dont write alot of comments ....
the name of my variables are clear
I try always to find the best algorithm "if i can for sure"

thank u