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When speaking of a period of time in the future, use in, and not after. Here in means after the end of.
Place the preposition for before words or phrases denoting a period of time: for three days, for six weeks, for two years, for a few minutes, for a long time. Use it with any tense except the present.
For is often omitted. We can say: I've been here for two years or I've been here two years.
Use to with distance, and till (until) with time.
In denotes position inside something, while into denotes motion or direction towards the inside of something.
Always write the preposition into as one word.