"tomuchwork" yours is a very rational, positive and fair post.
I was also interested in clarifying this kind of position, which I consider very interesting for a senior First Officier looking around.
If you are prepared and even lucky ideally the path could be like this I suppose:
-Selection
-Type rating
-Line training
-6 months / 500 hrs
-Sim check /evaluation
-Command course
One year ?
If anyone even know about type rating deduction scheme it would be also appreciated.