How long before a debt is written off?

Could you please elaborate on the process of writing off a debt and provide an estimate of how long it typically takes before a debt is officially considered as written off? Are there any specific factors that can impact the duration of this process, such as the type of debt, the amount owed, or the creditor's policies? Additionally, how does the process of writing off a debt differ from other methods of debt resolution, such as debt consolidation or settlement?