The past perfect tense goes further back in time, relative to something else that is itself in the past. The "something else" must be supplied by the context. For example: I had been working in Kuwait for a long time, when suddenly and unexpectedly I lost my job.
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wisdom27Which tense is correct here?I would just say I worked in Kuwait for a long time. That means you worked in Kuwait during some period of time that came to an end some time ago.