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Since is used to specify time in the past and continuing until present. For example, "Since 2010 Indian cricket team has been doing pretty well." We use "for" to specify duration of time like "They were playing for four hours". Here, I'm is wrong usage with "for two weeks" as we cannot use "present tense" for action which happened in past and running to present. For such cases, we use the "Present Perfect tense".
https://leo.stcloudstate.edu/grammar/tenses.html
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