Kernrechtsfrage
Whether the payment notice under Art. 257d CO was invalid because it granted only 29 days instead of 30.
Extrahierter Entscheid
The shortened notice did not invalidate the termination in these circumstances because the tenants acted in bad faith in relying on the one-day shortfall.
Extrahierte Begründung
Although Art. 257d CO requires at least 30 days, the tenants had long ceased paying rent and did not show they would have paid within 30 days anyway; relying on the formal defect would be contrary to good faith.