Ask HN: How much time developer should take to write dockerfile

Assuming you knew little bit about docker, how much time would dev require to write dockerfile (configure dependencies and make production usable).

Also, I'm looking for approximate time and what would you recommend to junior dev or senior dev who are just starting with docker.

Basically i'm looking for some realistic experience with timeline dev would take as my company going start using this technology. I love to hear your thoughts on it.