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FOR AND SINCE

For

It is used to express the duration of an action, the period of an action or an event.

it can be used with practically all verb tenses, especially the continuous ones.

EXAMPLES

for six years, for a week, for a month, for hours, for two hours

I have worked here for five years.

Since

It is used to indicate a moment from which the action continues.

"Since" + specific moment

EXAMPLES

since this morning, since last week, since yesterday

since I was a child, since Wednesday, since 2 o'clock

I have worked here since 1990.