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by OJFord 486 days ago
That still doesn't sound natural to me. You could answer 'since when' with 'two days ago', but declaring it as a statement I'd say 'for the last two days' or 'since the day before yesterday'.

You could get away with it in speech since it sounds like 'since.. [thinking] two days ago' and it's acceptable to change construction like that in casual speech, but written it doesn't seem right to me.