how much time/effort does it take to be perfect at programming syntax (no typos or missing characters ) ?

Answer 1

a week max if you are serious. :)

Answer 2

None... you (we) will ever and ever do mistakes by typing code, as said also by @Jordan and @Daniel.
Only frequency will be from less to less, but never reach the zero limit ;P

Answer 3

You will never get to the point of no errors, at least not if you are human.

Answer 4

Trust me pal, you can't get to that. we write codes, we are not codes. no one can be perfect, so take it easy on yourself.