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What is your goal when you lap a valve which has been leaking?
If you need more details, propose a situation/engine, this is a broad question.
Are you bandaid-ing it to keep it going til the soon-to-be-required cylinder change?
Are you doing a temporary fix, and expect to do it again within 100 or 200hours?
Are you setting it right and if the engine is managed well from that point, you could get another 500hrs without intervention?
What are reasonable expectations with valve lapping?
If you need more details, propose a situation/engine, this is a broad question.
Are you bandaid-ing it to keep it going til the soon-to-be-required cylinder change?
Are you doing a temporary fix, and expect to do it again within 100 or 200hours?
Are you setting it right and if the engine is managed well from that point, you could get another 500hrs without intervention?
What are reasonable expectations with valve lapping?