There's no one-size-fits-all answer. Here are some factors to consider: 1. Industry and sales cycle: The typical sales cycle for your industry might influence how long you keep a lead in that stage. Complex B2B sales cycles might allow for longer nurturing periods compared to simpler B2C transactions. 2. Lead activity and engagement: If a lead hasn't shown any recent activity or engagement with your marketing efforts, it might be time to disqualify them. 3. Internal lead qualification criteria: Establish clear lead qualification criteria within your sales team. Leads that don't meet these criteria after a reasonable timeframe can be disqualified.