Does the Severity of the Price Impact Depend on the Duration of the 51% Attack?

Yes, the longer the attack persists, the more severe the price impact. A short attack might be viewed as an isolated incident, but a prolonged attack demonstrates a fundamental, unfixable security flaw.

Longer attacks allow for more double-spends, greater financial damage, and a more profound loss of investor confidence, leading to a deeper and more lasting price depreciation.