It should stay active for at least ten years if you keep at least 2,000B in it. If under 2k they can deduct a 50B/month inactivity fee after a year with no activity. It used be forever, if you kept 2,000B, the 10 year thing was a proposed law around 2018 that I'm not sure was ever enacted.
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46/dormant-account-law-details-emerge