Using FOR - SINCE

For can be used with all tenses. Here are a few examples:

* They study for two hours every day.
* They are studying for three hours today.
* He has lived in Bangkok for a long time.
* He has been living in Paris for three months.
* I worked at that bank for five years.
* Will the universe continue for ever?

For is NOT used with "all day", "all the time" etc.

* I was there all day. (not *for all day)

Since is normally used with perfect tenses:

* He has been here since 9am.
* He has been working since he arrived.
* I had lived in New York since my childhood.

Since can also be used in the structure "It is [period] since...":

* It is a year since I saw her.

* How long is it since you got married?