In your mind how much time should I ....

Question

can you tell me or suggest me something with your experience that how much time should I spend on a programming language for being​ expert of that????

Answer 1

That depends a lot on you, maybe some lenguages are easier for you than for other or otherwise. It is very individual

Answer 2

agree with @elizabeth

Answer 3

i think 2 years to 10 years