I would like to know how to use " over the years and in years"?
1. Auto loans now are at the highest levels in 16 years. Does the word 'in' implies 'after' here?
2. Roush has dominated this place in years. In the sentence, Does the word 'in' implies ' from' ?
3. They have learned the ways of this nation in 12 years. Does the word 'in' implies 'after' or 'from' ?
4. The rich have attracted their share of plunderers over the years. Does the sentence have the same meaning like 'The rich have attracted their share of plunderers for years'?

I would like to know one more thing that where we use 'for' like in the following sentence:
I have been watching the same movie for hours.
Could I say ' in hours' or 'over the hours' instead of 'for hours'?